;
- Okinawa dialect
- Okinawa flying fox
- Okinawa prefecture
- Okinawa pygmy-goby
- Okinawa rail
- Okinawa rubble goby
- Okinawa school of karate
- Okinawa woodpecker
- Okinawan dish of pig ears
- Okinawan doughnut
- Okinawan dragon boat race
- Okinawan fixed form poetry
- Okinawan fortress
- Okinawan habu
- Okinawan kobudo
- Okinawan lion statues
- Okinawan scale
- Okinawan stir-fry dish
- Okinawan sweet
- Okinawan traditional three-stringed instrument
- Okinawan yellow cucumber
- Oklahoma
- Okuni kabuki
- Okuninushi
- Old Black Joe
- Old Economy
- Old English sheepdog
- Old Parr
- Old Testament
- Old World flycatcher
- Old World hookworm
- Old World monkey
- Old World vulture
- Old and New Testaments
- Olea fragrans
- Oleaceae
- Oligocene epoch
- Olympia
- Olympiad
- Olympic Charter
- Olympic Congress
- Olympic Day
- Olympic Flag
- Olympic Flame
- Olympic Games
- Olympic Park
- Olympic Torch
- Olympic Village
- Olympic Winter Games
- Olympic athlete
- Olympic event
- Olympic flag
- Olympic flame
- Olympic record
- Olympic torch
- Olympic torch relay
- Olympic year
- Olympics
- Olympus
- Om
- Oman
- Oman butterflyfish
- Omi
- Omi beef
- Omnibus Trade and Competition Act
- Omobranchus elegans
- Omphalius pfeifferi pfeifferi
- Omphalodes japonica
- Omron Corporation
- Omuro
- On reading
- On second thoughts ...
- On-Line Analytical Processing
- Once a beggar
- Once over the border
- Once you suspect something
- Oncorhynchus nerka kawamurae
- Oncotympana maculaticollis
- One Thousand and One Nights
- One good turn deserves another
- One man's fault is another's lesson
- One man's meat is another man's poison
- One should not interfere in lover's quarrels
- One who is cornered will fight like a devil
- One's strength is his weakness
- OneWorld
- Oni
- Onin War
- Oniwaban
- Only a hero can understand a hero
- Only the husband does not know
- Onmyoudou
- Onoclea orientalis
- Onogoro Island
- Onokoro Island
- Ontake-kyo
- Ontario
- Oomoto
- Oort cloud
- Open Computer Network
- Open Document Architecture
- Open Sesame!
- Open Systems Interconnection
- Open University
- OpenClient
- OpenDoc
- Operation Code
- Operation Tomodachi
- Operations manuals
- Ophidion asiro
- Ophioplocus japonicus
- Ophiuchus
- Opium War
- Opium Wars
- OptiPlex
- Optical Channel Adapter
- Optical Mark Reader
- Optical Sensor Mouse
- Option key
- Opus Dei
- Oracle 7
- Oracle 8
- Oracle 8i
- Oracle 9i
- Oracle 9iAS
- Oracle Applications
- Oracle EBS
- Oracle iAS
- Orange Revolution
- Order of Cultural Merit
- Order of Culture
- Order of Friars Minor
- Order of Preachers
- Order of Saint Benedict
- Order of the Chrysanthemum
- Order of the Precious Crown
- Order of the Rising Sun
- Order of the Sacred Treasure
- Orders of the Precious Crown
- Orders of the Rising Sun
- Orders of the Sacred Crown
- Orders of the Sacred Treasure
- Ordinance of the Konin Era
- Ordovician period
- Orectolobidae
- Orectolobus
- Oregon
- Oregon pine
- Oreochromis
- Organization of Arab Petroleum Exporting Countries
- Organization of Petroleum Exporting Countries
- Orient
- Orient and Occident
- Orient express
- Oriental
- Oriental Studies
- Oriental art
- Oriental bezoar
- Oriental blood fluke
- Oriental butterflyfish
- Oriental country
- Oriental cuckoo
- Oriental false hawksbeard
- Oriental fire-bellied toad
- Oriental flying gurnard
- Oriental fruit fly
- Oriental garden cricket
- Oriental greenfinch
- Oriental history
- Oriental liver fluke
- Oriental longheaded locust
- Oriental medicine
- Oriental paper bush
- Oriental photinia
- Oriental rug
- Oriental stork
- Oriental turtle dove
- Orientalism
- Orientalist
- Orientals
- Origin of Species
- Orion
- Orion Nebula
- Orlon
- Ornithischia
- Orthodox Church
- Orthoptera
- Oryzanin
- Osaka
- Osaka Conference
- Osaka High Court
- Osaka Incident
- Osaka Securities Exchange
- Osaka city
- Osaka dialect
- Osaka sumo tournament
- Osaka-Kobe
- Osaka-fu
- Oscar
- Oshima cherry
- Oshima tsumugi weave
- Osmanthus fragrans
- Ostrich fern
- Ostrogoth
- Ostwald color system
- Osumi class vehicle transport ship
- Oswego tea
- Otani sect
- Otani sect of Shinshu
- Otenmon conspiracy
- Othello
- Otowaya
- Ottawa
- Ottoman Empire
- Ottoman Turks
- Ottoman dynasty
- Ouan era
- Ouch!
- Ouchou era
- Ouei era
- Ouhou era
- Ounin era
- Our
- Out of sight
- Out of the mouth comes evil
- Outer Mongolia
- Outer shrine of Ise
- Outoku era
- Output Control System
- Output Processor
- Outstanding Performance Award
- Ouwa era
- Overhead Projector
- Overseas Economic Cooperation Fund
- Oversight Department
- Oversight Department of the Left
- Owara-Kaze-no-Bon Festival
- Oxbridge
- Oxford
- Oxford school
- Oxyfull
- Oxyopes sertatus
- Oya tuff stone
- Oyashio class submarine
- Ozone Layer Protection Law
- Oバック [オーバック]
- Oリング [オーリング]
- O型 [オーがた]
- P
- P [ピー]
- P-valve
- P-wave
- P.O.box address
- P.S.
- P24T
- P2H4
- P3C
- P3C [ピーさんシー]
- P5
- P54C
- P55C
- P6
- P7
- PA
- PA system
- PA system on a train
- PA-RISC
- PABX
- PAD
- PAPVC
- PAPVD
- PAPVR
- PASCAL
- PASMO
- PB
- PB SRAM
- PBX
- PBX [ピービーエックス]
- PC
- PC DOS
- PC [ピーシー]
- PC board
- PC shop
- PC tax reduction
- PC using a TV as a monitor
- PC-98
- PC-AT
- PC-PTOS
- PC-VAN
- PC-XT
- PC100
- PCB
- PCI
- PCI [ピーシーアイ]
- PCM
- PCM [ピーシーエム]
- PCMCIA
- PCO
- PCR
- PCR法 [ピーシーアールほう]
- PCS
- PCTR
- PCWEEK
- PD
- PD PR
- PDA
- PDA [ピーディーエー]
- PDAU
- PDL
- PDM
- PDP
- PDS
- PDU
- PECC
- PEL
- PEN club
- PER
- PER [パー]
- PET
- PET [ペット]
- PET bottle
- PETボトル [ペットボトル]
- PF key
- PG
- PGI
- PH3
- PHS
- PHS [ピーエイチエス]
- PHS [ピーエッチエス]
- PHS phone
- PHS portable phone
- PHY
- PI
- PIAFS
- PICS
- PICT
- PIF
- PIM
- PIN
- PIO
- PIXIT
- PK
- PKF
- PKF [ピーケーエフ]
- PKO
- PKO [ピーケーオー]
- PKZIP
- PL
- PL-1
- PL-SQL
- PLC
- PL教団 [ピーエルきょうだん]
- PM
- PM [ピーエム]
- PMO
- PO
- POP
- POP3
- POPmail
- POS
- POS system
- POSIX
- POW camp
- PPE
- PPI
- PPM
- PPP
- PR
- PR [ピーアール]
- PR brochure
- PR department
- PR manager
- PRAM
- PRDMD
- PRI
- PRMD
- PROLINEA
- PROLOG
- PROM
- PRP
- PReP
- PS
- PS-2
- PSG
- PSI
- PSINet
- PSION
- PSK
- PSRAM
- PSU
- PSW
- PT
- PTA
- PTA [ピーティーエー]
- PTO
- PTOS
- PTSD
- PTSD [ピーティーエスディー]
- PTT
- PUREX
- PUREX [ピューレックス]
- PUREX process
- PV
- PV [ピーブイ]
- PVAC
- PVC
- PVC [ピーブイシー]
- PVC pipe
- PVC管 [ピーブイシーかん]
- PWB
- PWR
- PWR [ピーダブリューアール]
- PX
- Pacific
- Pacific Economic Cooperation Council
- Pacific Islands
- Pacific League
- Pacific Ocean
- Pacific Ocean coastal regions of Honshu
- Pacific Ocean countries
- Pacific Rim nations
- Pacific Telesys
- Pacific Time
- Pacific War
- Pacific blackdragon
- Pacific bluefin tuna
- Pacific coast
- Pacific cod
- Pacific double-saddle butterflyfish
- Pacific fleet
- Pacific flying squid
- Pacific golden plover
- Pacific gregory
- Pacific herring
- Pacific island flatsedge
- Pacific lamprey
- Pacific longnose chimaera
- Pacific needlefish
- Pacific ocean perch
- Pacific oyster
- Pacific sandeel
- Pacific saury
- Pacific silver fir
- Pacific spadefish
- Pacific spookfish
- Pacific three-toothed lamprey
- Pacific white-sided dolphin
- Packard
- Paeonia suffrutticosa
- Page Description Language
- PageMill
- Paisley
- Pakistan
- Palace of the Dragon King
- Palaearctic
- Palaeolithic culture
- Palau
- Palearctic
- Paleocene epoch
- Paleolithic culture
- Paleotropical
- Paleozoic era
- Paleozoic group
- Palestine
- Pali
- Pallas's rosefinch
- Pallava Dynasty
- Palm Sunday
- Palmae
- Pan
- Pan-Americanism
- Pan-Asiatic Conference
- Pana-Wave Laboratory
- Panaeolus papilionaceus
- Panama
- Panama sergeant major
- Panama spadefish
- Panamanian sergeant
- Panamax
- Panamic sergeant major
- Panasert hole
- Pandanus boninensis
- Pandara
- Pandora's box
- Pangaea
- Panjabi
- Panmunjon
- Panthera
- Pantone
- Pap
- Pap smear
- Pap test
- Papa
- Papaver rhoeas
- Papenfussiella kuromo
- Paphia euglypta
- Papua New Guinea
- Papua monitor
- Papuan black snapper
- Papuan toby
- Para rubber
- Para rubber tree
- Parabenzoin praecox
- Paracanthurus
- Paradise Lost
- Parafontaria laminata
- Paragaleus
- Paralympics
- Parapoxvirus
- Parascylliidae
- Parascyllium
- Parathion
- Pardon makes offenders
- Pardon me for leaving
- Parent-Teacher Association
- Pareto optimum
- Paris
- Paris Collection
- Paris club
- Paris syndrome
- Paris tetraphylla
- Paris verticillata
- Parkinson
- Parkinson's disease
- Parkinson's law
- Parlement
- Parmaturus
- Parmesan cheese
- Parnassian
- Parnassians
- Parsee
- Parsi
- Parthenon
- Particle System
- Parupeneus
- Pascal
- Pascal's law
- Pascal's theorem
- Pascal's triangle
- Passable
- Passing a whole task onto someone else
- Passion Play
- Passion Week
- Passion music
- Passover
- Pastoral Epistles
- Patagonian toothfish
- Patent Act
- Patience is the only way
- Patriotic War
- Pauli's principle
- Pauline Epistles
- Pauline epistles
- Paullinia cupana
- Paulownia tomentosa
- Pavlov
- Pax Americana
- PbO2
- Peace Preservation Act
- Pearl Harbor
- Peasants' Revolt
- Peasants' War
- Pediculus humanus
- Peeping Tom
- Pegasus
- Pekinese
- Peking
- Peking duck
- Peking man
- Pekingology
- Pele's hair
- Pele's tears
- Pellucida pygmy goby
- Peloponnesian War
- Pemba chromis
- Penglai Island
- Penicillium
- Pennsylvania
- Pennsylvania Dutch
- Pennsylvania German
- Penrose
- Penstemon frutescens
- Pentagon
- Pentateuch
- Pentax
- Pentecost
- Pentecostal movement
- Penthorum chinensis
- Pentium
- Pentium II
- Pentium II Xeon
- Pentium III
- Pentium ODP
- Pentium Pro
- Peony
- People may be offended by the way you speak
- People of God
- People will talk
- People's Army
- People's Commissar
- People's Liberation Army
- People's New Party
- People's Republic of China
- PeopleSoft
- Pepsi
- Percheron
- Perciformes
- Percoidei
- Perfect timing!
- Perfection of Wisdom
- Perilla frutescens
- Perilla frutescens var. frutescens
- Peripatetic school
- Perissodactyla
- Perl
- Perl-Tk
- Permanent Virtual Circuit
- Permian period
- Perseids
- Perseus
- Persia
- Persian
- Persian Gulf crisis
- Persian Wars
- Persian carpet
- Persian cat
- Persian person
- Persian speedwell
- Personal Area Network
- Personal Information Protection Law
- Personal Status Actions Procedure Law
- Personifer angelfish
- Peru
- Peruvian chromis
- Peter Pan
- Peter Pan collar
- Peter Pan syndrome
- Petri
- Petri dish
- Petri-net
- Petromyzon
- Petromyzontidae
- Peucedanum japonicum
- Peyronie's disease
- PhD
- Phalaenopsis
- Phanerozoic
- Pharisee
- Pharisees
- Pharmaceutical Affairs Law
- Pharmaceutical and Food Safety Bureau
- Phase Modulation
- Phasianidae
- Pheropsophus jessoensis
- Philadelphia
- Philadelphia fleabane
- Philadelphus satsumi
- Philip
- Philippine Sea Plate
- Philippine butterflyfish
- Philippines
- Philippines chevron butterflyfish
- Philippines chromis
- Philips
- Philistine
- Philistine people
- Phillips curve
- Phillips head screwdriver
- Philopon
- Philosophiae Naturalis Principia Mathematica
- Phocidae
- Phoenicia
- Phoenician alphabet
- Phoenician character
- Phoenix
- Pholidota
- Phong shading
- PhotoCD
- Phylum Magnoliophyta
- Physical Address Extension
- Physical Delivery
- Physical Delivery Access Unit
- Physical Delivery System
- Pi
- Piaget
- Picasso
- Pictor
- Pieris japonica
- Pieris melete
- Pieta
- Pietism
- Pilgrim Fathers
- Pilgrim's Progress
- Pilsener
- Pilsner
- Piltdown hoax
- Piltdown man
- PinYin
- Pinaceae
- Pinales
- Pindola
- Pindola Bharadvaja
- Pinna bicolor
- Pinot Noir
- Pioneer
- Pippin ATMARK
- Pisa
- Pisces
- Pitcairn
- Pithecanthropus erectus
- Pituitrin
- Pixar
- Placamen tiara
- Planck's constant
- Planck's law
- Planck's quantum hypothesis
- Plantae
- Plantaginaceae
- Platax
- Plato's problem
- Platonic love
- Platonism
- Platycodon grandiflorum
- Playing the dandy ruins a man
- Playstation
- Plaza agreement
- Please excuse my thoughtless words.
- Plectranthus inflexus
- Pleiades
- Pleiades cluster
- Pleiades star cluster
- Pleioblastus chino
- Pleistocene epoch
- Plesiosaurus
- Pleuronectes
- Plimsoll line
- Plimsoll mark
- Pliocene epoch
- Plough
- Plum Blossom Festival
- Pluto
- PnP
- Poaceae
- Podocarpus macrophyllus var. maki
- Point Of Sales
- Point-Of-Sale
- Poisson distribution
- Poland
- Polaris
- Polaroid
- Polaroid camera
- Polaroid picture
- Police hi-tech crime centre
- Polisario Front
- Polish
- Polish notation
- Politburo
- Political Funds Control Law
- Pollia japonica
- Polluter Pays Principle
- Polyergus samurai
- Polygonaceae
- Polygonatum falcatum
- Polygonum cuspidatum
- Polygonum filiforme
- Polygonum tenuicaule
- Polylepion russelli
- Polynesia
- Polynesians
- Pomacanthus
- Pomacentridae
- Pomacentrus
- Pomeranian
- Ponerorchis graminifolia
- Ponzi scheme
- Pope
- Popess
- Popillia japonica
- Populus euphratica
- Poria cocos
- Porphyra tenera
- Porphyra yezoensis
- Porsche
- Port Jackson shark
- Port and Harbor Authority
- Portege
- Portland cement
- Portugal
- Portuguese
- Portuguese Jesuits
- Portuguese card game popular in Japan during the late 16th century
- Portuguese man-of-war
- Portulaca
- Poseidon
- Post Office box address
- Post-It
- Post-impressionism
- Postal Bureau
- Postal Savings Bureau
- Postal Savings system
- Postal Services Agency
- Postgres
- Postpet
- Potsdam Conference
- Potsdam Declaration
- Potsdam Orders
- Potter's angelfish
- Poverty dulls the wit
- Poverty is a stranger to industry
- Power++
- PowerBuilder
- PowerDesigner
- PowerJ
- PowerOPEN
- PowerPC
- PowerSite
- PowerSoft
- Powerbook
- Prabhutaratna
- Prague
- Prajnaparamita
- Prajnaparamita Sutra
- Pravda
- Prayer to the Four Quarters
- Pre-Raphaelite Brotherhood
- Precambrian era
- Premier
- Presbyterian Church
- Presbyterians
- President of the United States of America
- Presta valve
- Pretoria
- Prevention is better than cure
- Preventive Vaccination Law
- Pride comes before a fall
- Pride will have a fall
- Primates
- Prime Minister
- Prime Minister also serving as Foreign Minister
- Prime Minister or Premier
- Prime Minister's office
- Prime Minister's official residence
- Princess Sen
- Print Gokko
- Print Manager
- Prionace
- Prionurus
- Prius
- Private Branch eXchange
- Private Directory Management Domain
- Private Management Domain
- Private company
- Privilege-Attribute-Certificate
- Privy Council
- Prize for Creativity
- Prize to Schools for Nurturing Creativity
- Pro*C
- ProActive
- Prodigy
- Product Liability
- Prognathodes
- Programmed Input-Output
- Programming in Logic
- Progressive Conservative Party of Canada
- Prohibition Law
- Prometheus
- Promide
- Promised Land
- Proscylliidae
- Proscyllium
- Proscyllium venustum
- Prospect is often better than possession
- Protection of Personal Liberty Law
- Protector General
- Protectorate General
- Protectorate General of Annam
- Protectorate General of Beiting
- Protectorate General of the Central Asian Nomadic Lands
- Protectorate General of the Western Regions
- Protectorate General to Pacify the East
- Protectorate General to Pacify the North
- Protectorate General to Pacify the West
- Proterozoic era
- Protestant Church
- Protestant Episcopal Church
- Protestantism
- Proto-Indo-European
- Protocol Data Unit
- Protocol Machine
- Protura
- Proverbs
- Providence
- Providing is preventing
- Prunus cerasifera var. atropurpurea
- Prunus donarium
- Prunus itosakura
- Prunus japonica
- Prunus mume var. bungo
- Prunus persica var. densa
- Prunus pseudo-cerasus
- Prunus salicina
- Prunus yedoensis
- Prussia
- Prussian
- Prussian blue
- Przewalski's horse
- Psalms
- Pseudobagrus ichikawai
- Pseudocarcharias
- Pseudocarchariidae
- Pseudomonas aeruginosa
- Pseudorinelepis genibarbis
- Pseudotriakidae
- Pseudotriakis
- Psyche
- Pteranodon
- Pteria brevialata
- Pteromys volans orii
- Ptolemaic Dynasty
- Ptolemaic constellations
- Ptolemaic theory
- Ptolemy
- Public Corporation and National Enterprise Labor Relations Commission
- Public Corporations and Government Enterprises Labor Relations Act
- Public Key Infrastructure
- Public Nursing Care Insurance Law
- Public Office Election Law
- Public Prosecutor's Office
- Public Security Examination Commission
- Public Security Intelligence Agency
- Pubzine
- Puccini
- Pueblo
- Pueblo Indian
- Puer tea
- Puerto Rico
- Pugwash conferences
- Pulitzer
- Pulitzer prize
- Pullman car
- Pungtungia herzi
- Punic Wars
- Punica granatum
- Punjabi
- Pure Land
- Pure Land Buddhism
- Pure Land sect
- Pure Land teachings
- Puritan
- Puritan Revolution
- Purkinje cell
- Purkinje effect
- Purkinje fiber
- Purkinje fibre
- Purple Forbidden Enclosure
- Putin
- Pyongyang
- Pyramidon
- Pyrex
- Pyrex glass
- Pyroceram
- Pyrrosia tricuspis
- Pythagorean temperament
- Pythagorean theorem
- Pythagorean tuning
- Pyxis
- Pタイル [ピータイル]
- Pバルブ [ピーバルブ]
- P波 [ピーは]
- Q
- Q [キュー]
- Q fever
- Q-Vision
- QA
- QAM
- QED
- QLD
- QOL
- QOL [キューオーエル]
- QOS
- QR code
- QRコード [キューアーコード]
- QRコード [キューアールコード]
- QSO
- QT延長症候群 [キューティーえんちょうしょうこうぐん]
- QUICK B
- QUICK-VAN
- QUICKEN
- Qi
- Qiang
- Qin
- Qing
- Qing Dynasty
- Qing government
- Qing-dynasty system assigning equal numbers of Manchurians and Han Chinese to central government agencies
- Qing-era Chinese music
- Qingtan
- Quadrature Amplitude Modulation
- Quaker
- Quakers
- Quantum
- Quanzhen
- Quaternary period
- Quebec
- Quecha
- Quechua
- Queen Anne's lace
- Queen Mother
- Queen Mother of the West
- Queen's English
- Queensland
- Queensland grouper
- Queensland pygmy goby
- Queensland yellowtail angelfish
- Quercus dentata
- Quercus gilva
- Quercus sessilifolia
- Quichua
- QuickDraw
- QuickTime
- Quonset hut
- Qur'an
- Quran
- Q熱 [キューねつ]
- R
- R & B
- R [アール]
- R and D
- R&D
- R&D [アールアンドディー]
- R-18
- RAD
- RAM
- RAM [ラム]
- RAMDAC
- RAPCON
- RAS
- RAS [ラス]
- RBI
- RBI hit
- RBOC
- RC造 [アールシーぞう]
- RDA
- RDB
- RDBMS
- RDO
- RDS
- README
- REM
- REM [レム]
- REM sleep
- REM睡眠 [レムすいみん]
- RENGO
- RESale
- RETURN key
- REXX
- RF
- RF [アールエフ]
- RFC
- RFID
- RFID [アールエフアイディー]
- RFID tag
- RFP
- RF−ID [アールエフアイディー]
- RFタグ [アールエフタグ]
- RGB
- RGNP
- RHR
- RIMNET
- RIP
- RISC
- RISC [リスク]
- RJ
- RJE
- RLS
- RMI
- RMS
- RN
- RNA
- RNA [アールエヌエー]
- RNA virus
- RNAウイルス [アールエヌエーウイルス]
- RO
- ROA
- ROE
- ROLAP
- ROM
- ROM [ロム]
- ROTC
- ROTFL
- RP
- RPG
- RPN
- RPS
- RS
- RS virus
- RS-232C
- RS-232D
- RS-422
- RS232ケーブル [アールエスにさんにケーブル]
- RSI
- RSPT
- RSウイルス [アールエスウイルス]
- RTF
- RTFJ
- RTS
- RU 486
- RU-486
- RU486 [アールユーよんはちろく]
- RV
- RV [アールブイ]
- RV車 [アールブイしゃ]
- RWCS
- RZ
- Rachmaninoff
- Ragaraja
- Rahmen
- Rainford's butterflyfish
- Rajput
- Ralph Lauren
- Ramadan
- Raman effect
- Ramanas rose
- Rambus
- Ramsar Convention
- Randall's chromis
- Randall's pygmy goby
- Rangoon creeper
- Ranunculaceae
- Ranunculales
- Rape of Nanking
- Rapture
- Rashidun period
- Rasta
- Rastafari movement
- Rastafarian
- Rastafarianism
- Ratnasambhava
- Ray-Ban
- Rayleigh scattering
- Rayleigh wave
- Raynaud's disease
- Reading something again and again
- Reaganomics
- Real Presence
- RealAudio
- Really!
- Really?
- Records of Ancient Matters
- Recovery Management Support
- Red
- Red Army
- Red Book
- Red Brigades
- Red Crescent Society
- Red Cross
- Red Cross Convention
- Red Crystal
- Red Data Book
- Red Flag
- Red Guards
- Red Queen hypothesis
- Red Sea
- Red Sea angelfish
- Red Sea bannerfish
- Red Sea chevron butterflyfish
- Red Sea goatfish
- Red Sea raccoon butterflyfish
- Red Sea sailfin tang
- Red Sea surgeonfish
- Red Turban Rebellion
- Red sky at night
- RedBrick
- RedHat Linux
- Redfin butterflyfish
- Reduced Instruction Set Computer
- Reebok
- Reeves spirea
- Reeves' turtle
- Reference Only
- Reform Party
- Reform Shinto
- Reformation
- Reformed Churches
- Regional Bell Operating Company
- Regional Code
- Regulus
- Reiki
- Reiki era
- Reiyukai
- Rekiou era
- Relational Database system
- Remington
- Remote Access Services
- Remote Job Entry
- Remote Operation Service Element
- Renaissance
- Renault
- Repeated reading
- Reproduction Prohibited
- Republic of Angola
- Republic of China
- Republic of Ghana
- Republic of Greece
- Republic of Guatemala
- Republic of Guinea
- Republic of Guinea-Bissau
- Republic of Haiti
- Republic of Honduras
- Republic of Kenya
- Republic of Korea
- Republic of Mozambique
- Republic of South Africa
- Republic of Zambia
- Republic of Zimbabwe
- Republic of the Congo
- Republic of the Gambia
- Republican Party
- Republique francaise
- Request-To-Send
- Requiem Mass
- Reserve Officers' Training Corps
- Resources Super Profits Tax
- Respect-for-the-Aged Day Holiday
- Respectfully yours
- Restless Leg Syndrome
- Restoration Shinto
- Return-to-Zero
- Reunion
- Reuters
- Revelation
- Revised Version
- Reye's syndrome
- Reynoutria japonica
- Rh
- Rh blood type
- Rh factor
- Rhaeto-Romance
- Rhamnaceae
- Rhamnales
- Rhapis humilis
- Rhee Syngman
- Rhesus factor
- Rhincodon
- Rhincodontidae
- Rhine
- Rhine maiden who lured sailors to their doom
- Rhinochimaera
- Rhinochimaera africana
- Rhinochimaeridae
- Rhizophora mucronata
- Rhizopogon rubescens
- Rhizoprionodon
- Rhizopus
- Rhode Island
- Rhodea japonica
- Rhodeus atremius atremius
- Rhododendron macrosepalum
- Rhododendron metternichii
- Rhododendron metternichii var.
- Rhododendron oomurasaki
- Rhododendron spp.
- Rh因子 [アールエッチいんし]
- Rh式血液型 [アールエッチしきけつえきがた]
- Rias
- Ribes
- Rice Price Deliberative Council
- Rich is the person who is content with what he is
- Richard's dragonet
- Richardson Affair
- Richardson's dragonet
- Riches and honors are as fleeting as floating clouds
- Richter Scale
- Ricinus communis
- Ricoh
- Riemannian geometry
- Riesling
- Rig Veda
- Rigel
- Rigel Kentaurus
- Right
- Rigveda
- Rijndael
- Rikkokushi
- Rikkyo-Meiji game
- Ring of Fire
- Ringer's solution
- Rinzai school of Buddhism
- Ripple
- Rissho Kosei-kai
- Risso's dolphin
- Ritalin
- Ritsu
- Road Traffic Act
- Road Traffic Law
- Roche limit
- Roche's limit
- Rochelle salt
- Rochester
- Rocky Mountain goat
- Rocky Mountains
- Rodentia
- Roentgenium
- Roger's bronze leaf
- Rolex
- Rollback-initiating service primitive
- Rolls-Royce
- Rom
- Roma
- Romaji input
- Roman Catholic Church
- Roman Curia
- Roman Empire
- Roman god or goddess
- Roman law
- Roman mythology
- Roman myths
- Roman numerals
- Roman type
- Roman-nose spinefoot
- Romance languages
- Romancing SaGa
- Romanesque architecture
- Romani person
- Romanian
- Romano cheese
- Romansch
- Romantic music
- Romany
- Rome
- Rome was not built in a day
- Rookie of the Year award
- Roquefort
- Rorschach inkblot test
- Rorschach test
- Rosa laevigata
- Rosaceae
- Rosales
- Rosenberg's monitor
- Roseola infantum
- Rosetta Stone
- Rosetta stone
- Rosicrucian
- Rosser
- Rossignol
- Rossini
- Rotary Club
- Rotational Position Sensing
- Rotring
- Roumanian
- Round Table Conference on Rice Price
- Rouzhi
- Royal Host
- Royal Marines
- Royal Navy
- Royalists
- Rube Goldberg machine
- Rubik's Cube
- Rubus buergeri
- Rubus hirsutus
- Rubus palmatus var. coptophyllus
- Rubus trifidus
- Ruby
- Rule
- Rumanian
- Ruputer
- Rus'
- Russell's viper
- Russell-Einstein Manifesto
- Russia
- Russia and France
- Russia and Japan
- Russian
- Russian 3-stringed instrument with a triangular body
- Russian Communist Party
- Russian Orthodox Church
- Russian Revolution
- Russian army
- Russian blouse
- Russian character
- Russian characters
- Russian nesting doll
- Russian person
- Russian rock birch
- Russian roulette
- Russian-Japanese
- Russo-German War
- Russo-Japanese War
- Russo-Japanese treaty in which Japan exchanged Sakhalin for the Kuril Islands
- Russo-Turkish War
- Ruth
- Rwanda
- Ryakunin era
- Ryakuou era
- Rydberg constant
- Ryougoku
- Ryukyu long-haired rat
- Ryukyu odd-tooth snake
- Ryukyu rabbit
- Ryukyu robin
- Ryukyu sika
- Ryukyu spiny rat
- Ryukyu tree lizard
- Ryukyuan languages
- Ryuukyuu Islands
- S [エス]
- S size
- S-shape
- S-wave
- S.
- S3
- SA
- SAA
- SAD
- SALT
- SAM
- SAP
- SAP R-3
- SAR
- SARS
- SARS [サーズ]
- SAS
- SASE
- SAT
- SB
- SB [エスビー]
- SBR
- SC
- SCANDISK
- SCARA
- SCD
- SCID
- SCID [スキッド]
- SCID mouse
- SCIDマウス [スキッドマウス]
- SCM
- SCO
- SCOP
- SCR
- SCSI
- SCSI-2
- SCSI-3
- SCTR
- SCUBA
- SD
- SD-RAM
- SDF Law
- SDH
- SDK
- SDLC
- SDR
- SDRAM
- SDSL
- SDSL [エスディーエスエル]
- SDU
- SD法 [エスディーほう]
- SE
- SEAL
- SEC
- SETUP message
- SEWB
- SF
- SF [エスエフ]
- SFA
- SFX
- SGI
- SGML
- SI
- SIA
- SIDS
- SIG
- SII
- SIM card
- SIM lock cancellation
- SIM unlock
- SIMCITY
- SIMEARTH
- SIMカード [シムカード]
- SIMロック解除 [シムロックかいじょ]
- SIPP
- SIS
- SIS [シス]
- SJIS
- SL [エスエル]
- SLBM
- SLBM [エスエルビーエム]
- SLE
- SLE [エスエルイー]
- SLIP
- SMARTDRV
- SMF
- SMON
- SMP
- SMT
- SMT resistor
- SMTP
- SMU
- SNA
- SNAP
- SNAP [スナップ]
- SNOBOL
- SNP
- SNP [エスエヌピー]
- SNP [スニップ]
- SNR
- SNS
- SNS [エスエヌエス]
- SO
- SO-NET
- SOC
- SOE
- SOFA
- SOH
- SOHO
- SOLAS
- SONET
- SOP
- SOREMP
- SOS
- SOS [エスオーエス]
- SOTEC
- SOx [エスオーエックス]
- SOx [ソックス]
- SPARC
- SPC
- SPE
- SPECmark
- SPEEDI
- SPG
- SPL
- SPM
- SQL
- SQL Server
- SQL*Net
- SQL*Plus
- SRAM
- SRC造 [エスアールシーぞう]
- SRSV
- SS
- SS [エスエス]
- SS-user
- SSE
- SSL
- SSL [エスエスエル]
- SSPE
- SSPE [エスエスピーイー]
- SSR
- SSRI
- SST
- START
- STD
- STM
- STN
- STOL
- STOL [エストール]
- STOL [ストール]
- STX
- SUB
- SUBROC
- SUG
- SUSY
- SUT
- SUV
- SV
- SVA
- SVC
- SVD
- SVGA
- SVR
- SVR4
- SWAT
- SYBASE
- SYMBIOS
- SYN
- SYSTEM.INI
- Sabbath
- Sabin vaccine
- Sabrina pants
- Sacred War
- Sad Mac
- Sad to say
- Sadaparibhuta
- Saga Frontier
- Saga prefecture
- Sagami Railway
- Sagawa Express
- Sagittaria trifolia var. edulis
- Sagittarius
- Sahara
- Sahara desert
- Saigon
- Saiha
- Saikou era
- Saikyo
- Saint
- Saint Bernard
- Saint Helena butterflyfish
- Saint Kitts
- Saint Lucia
- Saint Luke's
- Saint Nicholas
- Saint-Simonism
- Saipan pygmy goby
- Saisetsu
- Saitama
- Saitama Bank
- Saitama Prefecture
- Saitama prefecture
- Saizeriya
- Sakhalin
- Sakhalin fir
- Sakhalin husky
- Sakhalin surf clam
- Sakra devanam Indra
- Sakurajima daikon
- Sakyamuni
- Salicaceae
- Salk vaccine
- Salmonella
- Salmonella typhi
- Salmonella typhimurium
- Salsola komarovii
- Salvadori's monitor
- Salvarsan
- Salvation Army
- Salvelinus
- Salwar kameez
- Samantabhadra
- Samantabhadra Contemplation Sutra
- Samoa
- Samoan mullet goby
- Samuel
- Samuel I
- Samuel II
- Samvara
- San
- San Diego
- San Francisco
- San Jose
- San Marino
- San-in region of western Honshu
- San-you region of western Honshu
- Sancho Sect
- Sandai Jitsuroku
- Sanforised
- Sanforized
- Sangen sect
- Sangerism
- Sangha
- Sanguisorba hakusanensis
- Sanja Festival
- Sankei Sports
- Sankei newspaper
- Sanmonto sect
- Sanno Shinto
- Sannou Festival
- Sannou Ichijitsu Shinto
- Sanriku earthquake of 869 CE
- Sanskrit
- Sanskrit characters
- Sanskrit multi-syllabic chant
- Sanskrit-Japanese dictionary
- Sanson-Flamsteed projection
- Sansuikaku
- Sansuiro
- Santa
- Santa Clara
- Santa Claus
- Santa Cruz
- Santa Fe
- Santa Maria
- Sanyo
- Sanyo district
- Sanzu River
- Sao Tome and Principe
- Saohime
- Sapayo cichlid
- Sapir-Whorf hypothesis
- Saposhnikovia divaricata
- Sapporo
- Saracen
- Saran wrap
- Saraswati
- Sarcandra glabra
- Sarcocheilichthys biwaensis
- Sarcocheilichthys variegatus variegatus
- Sarcocheillichthys variegatus
- Sargassum fulvellum
- Sarin
- Saros cycle
- Sarudabiko
- Sarudahiko
- Sarutabiko
- Sarutahiko
- Sasamorpha borealis
- Sasanishiki
- Saskatchewan
- Satan
- Satanic school
- Satsuma
- Satsuma Rebellion
- Satsuma and Choshu
- Satsuma biwa
- Satsuma clan
- Satsuma mock orange
- Satsuma porcelain
- Saturday
- Saturday and Sunday
- Saturday night special
- Saturn
- Saturn peach
- Saudi
- Saudi Arabia
- Saurischia
- Sauternes
- Say's law
- Sayyid
- Sayyid Dynasty
- Scan Talk
- Scandinavia
- Scandinavian
- Scandinavian countries
- Scanlon plan
- Scaramouche
- Scarus
- Scarus ovifrons
- Scatophagidae
- Scatophagus
- Schlegel's green tree frog
- Schmidt camera
- School Education Law
- School of Common Sense
- Schottky diode
- Schrodinger's cat
- Schroederichthys
- Schroedinger equation
- Schubert
- Schutzstaffel
- Schwann cell
- Sciadopitys verticillata
- Science Council of Japan
- Science and Culture
- Science and Technology
- Science and Technology Agency
- Scilla scilloides
- Scirpus hotarui
- Scirpus yagara
- Sciuromorpha
- Scoliodon
- Scolopendra subspinipes
- Scorpio
- Scot
- Scotch
- Scotch broom
- Scotch egg
- Scotch tape
- Scotch terrier
- Scotch tweed
- Scotch whiskey
- Scotch whisky
- Scotland
- Scotland Yard
- Scottish
- Scottish National Party
- Scottish law
- Scottish person
- Scripture
- Scrophulariales
- Sculptor
- Scutellaria indica
- Scutum
- Scyliorhinidae
- Scyliorhinus
- Sea Beam
- Sea of Japan
- Sea of Japan coastal areas
- Sea-Monkeys
- Seagate
- Sealab
- Searle
- Sears
- Seasat
- Seasonal Affective Disorder
- Seattle
- Sebastes iracundus
- Sebastes joyneri
- Sebree's pygmy goby
- Second Advent
- Second Empire
- Second Epistle of John
- Second Epistle of Peter
- Second Epistle to Timothy
- Second Epistle to the Corinthians
- Second Epistle to the Thessalonians
- Second Republic
- Second Section company
- Second Sino-Japanese War
- Second World War
- SecondLife
- Secretariat
- Secretary of Defence
- Secretary of State
- Sect Shinto
- Securities and Exchange Act
- Securities and Exchange Commission
- Security Council
- Security Council of Japan
- Security Export Control
- Sedum bulbiferum
- Sedum rupifragum
- See Naples and die
- See Naples and then die
- See you next week
- See you then
- Sega
- Sega Saturn
- Segway
- Seinfeld
- Seizan sect
- Sekigahara
- Sekko Zaibatsu
- Selective Compliant Articulated Robot Arm
- Selective Compliant Assembly Robot Arm
- Selenotoca papuensis
- Self Defense Force member
- Self-Contained Underwater Breathing Apparatus
- Self-Defense Force dispatch
- Self-Defense Force mission
- Self-Defense Forces Law
- Self-Defense Forces personnel
- Semang
- Semang people
- Semite
- Semites
- Semitic
- Senate
- Sendai
- Sendai Earthquake
- Sendai Tanabata Festival
- Sendai earthquake
- Senegal
- Senior chief engineer
- Senke school of tea ceremony
- Seoul
- Sephardim
- Sepoy Mutiny
- September
- September 11th attacks
- Septuagint
- Serbia
- Serbian
- Serenace
- Serial AT Attachment
- Serial Line Internet Protocol
- Serial Link IP
- Seriolina
- Serpent
- Serpent Bearer
- Serratia marcescens
- Serve the powerful for your own good
- Service Bureau
- Service Data Unit
- Set a thief to catch a thief
- Setai
- Seven Deities of Good Luck
- Seven Sages of the Bamboo Grove
- Seven Sisters
- Seven Wonders of the World
- Seven Years' War
- Seven-Eleven
- Seventeen-Article Constitution
- Several men
- Sevres porcelain
- Sextant
- Seychelles butterflyfish
- Seyfert galaxy
- Shakyamuni
- Shang
- Shanghai
- Shanghai Incident
- Shanghai cuisine
- Shanghaiese
- Shanghainese
- Shangri-La
- Shangri-la
- Shangti
- Shaolin kung fu
- Shared Virtual Area
- Sharp
- Shenxian thought
- Sherlockian
- Sherpa
- Shetland pony
- Shia
- Shiba
- Shidemasu Shinto
- Shifted JIS
- Shiga prefecture
- Shigaraki ware
- Shih-chi
- Shiji
- Shijimi clam caught during winter
- Shikoku
- Shikoku pilgrim
- Shikoku pilgrimage
- Shikoku region
- Shimabara Rebellion
- Shimane prefecture
- Shin Buddhism
- Shinagawa Prince Hotel
- Shinbashi
- Shinetsu Main Line
- Shingi Shingon
- Shingon
- Shingon Shinto
- Shinkage-Ryu
- Shinkansen
- Shinki era
- Shinri-kyo
- Shinriki
- Shinsengumi
- Shinshu-kyo
- Shinto
- Shinto Buddhist doctrines
- Shinto Festival of Origins
- Shinto Shusei-ha
- Shinto Taikyo
- Shinto Taiseikyo
- Shinto and Buddhism
- Shinto and Buddhism and Confucianism
- Shinto and Confucian ethical teachings
- Shinto fire-purification ceremony
- Shinto funeral
- Shinto god
- Shinto offering of cloth
- Shinto offerings
- Shinto or Buddhist prayer
- Shinto paper offerings
- Shinto priest
- Shinto priest of lower rank than kannushi and negi
- Shinto rites
- Shinto ritual in which a shaman or priest soaks bamboo grass in boiling water and sprinkles the water on worshippers
- Shinto ritual prayer
- Shinto rituals
- Shinto scripture
- Shinto shrine
- Shinto shrine on Buddhist temple grounds dedicated to the tutelary deity of the area
- Shinto shrine precincts
- Shinto style
- Shinto wedding
- Shinto-Buddhist amalgamation
- Shinto-ryu
- Ship American policy
- Ship Safety Law
- Shirane class destroyer
- Shiranui style of grand champion's ring-entering ceremony
- Shirokiya
- Shirvanshah
- Shisui Faction
- Shitamachi
- Shitoku era
- Shiva and Brahma
- Shizuoka
- Shizuoka prefecture
- ShockWave
- Shoei
- Shogi
- Shogitai
- Shogun's headquarters
- Shoki
- Shoki the Plague-Queller
- Shoku Nihon Kouki
- Shoku Nihongi
- Shokuho period
- Shoo!
- Shorin-ryu
- Shorinji Kempo
- Shotokan
- Shotoku Taishi
- Shouan era
- Shouchou era
- Shouchuu era
- Shouei
- Shougen era
- Shouhei era
- Shouho era
- Shouhou era
- Shouji era
- Shouka era
- Shoukei era
- Shoukyou era
- Shoukyuu era
- Shouou era
- Shouryaku era
- Shoutai era
- Shoutarou complex
- Shoutoku era
- Shouwa era
- Show me a liar