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- Republic of China
- Republic of China (1912–1949)
- Republic of Ireland
- Republic of Mahabad
- Republic of Taiwan (1895)
- Republic of Upper Volta
- Republic of Vietnam Military Forces
- Republic P-47 Thunderbolt
- Republican Party (United States)
- Republican People's Party
- Republican River
- Republicanism in the United States
- Reputation (Taylor Swift album)
- Requiem
- Res Gestae Divi Augusti
- Research and development
- Reservoir Dogs
- Residentie Orchestra
- Residual-current device
- Resilience
- Resin
- Resistor
- Resolved White
- Resonance
- Resource room
- Respiratory syncytial virus
- Respiratory system
- Responsible government
- Restaurant
- Resting potential
- Restriction enzyme
- Results of the 2016 Democratic Party presidential primaries
- Results of the 2016 Republican Party presidential primaries
- Resusci Anne
- Retail
- Retezat Mountains
- Rethymno
- Retroactive continuity
- Return of Saturn
- Return to Never Land
- Reubin Askew
- Réunion
- Reutte District
- Revenge
- Revenge porn
- Revenue
- Reverse transcriptase
- Review
- Revival
- Revolution (Six Flags Magic Mountain)
- Revolutions of 1848 in the German states
- Revolver (album)
- Rewa district
- Rex Tillerson
- Reykjanesbær
- Reykjavík-Keflavík Airport
- Reynolds Building
- Reza Alinejad
- RFID
- Rhabdodontidae
- Rhabdomyosarcoma
- Rhacophoridae
- Rhamphorhynchus
- Rhee Syng-man
- Rheinfelden, Switzerland
- Rhetoric
- Rhetorical question
- Rhetorical Triangle
- Rheumatism
- Rheumatoid arthritis
- Rhinatrematidae
- Rhind Mathematical Papyrus
- Rhine-Main-Danube Canal
- Rhineland
- Rhineland-Palatinate
- Rhinoceros
- Rhinovirus
- Rhins
- Rhipidistia
- Rhizaria
- Rhodes
- Rhodes (city)
- Rhodesian Ridgeback
- Rhombozoa
- Rhön
- Rhondda
- Rhyme
- Rhyme royal
- Rhyme scheme
- Rhynie
- Rhynie chert
- Rhysling Award
- Rhythm
- Rhythm and blues
- Rhythm game
- Rhythmic gymnastics
- RIAA certification
- Riace bronzes
- Riaz Ahmed Gohar Shahi
- Riaz Shahid
- Riboflavin
- Ribosome
- Ribozyme
- Ricardo Montalbán
- Ricardo Montaner
- Ricardo Montaner (album)
- Rice
- Rice County, Kansas
- Rich Girl
- Richard Aldington
- Richard Arkwright
- Richard Attenborough
- Richard Barrett
- Richard Briers
- Richard Burton
- Richard Cordley
- Richard D'Oyly Carte
- Richard Dawkins
- Richard Dominguez
- Richard Feynman
- Richard Griffiths
- Richard Hawley (actor)
- Richard Henderson
- Richard I of England
- Richard I, Duke of Normandy
- Richard II, Duke of Normandy
- Richard III of England
- Richard Kiel
- Richard Leakey
- Richard Lydekker
- Richard Lynch
- Richard Marsland
- Richard Mason (novelist)
- Richard Mentor Johnson
- Richard More
- Richard Nixon
- Richard Owen
- Richard R. Schrock
- Richard Roberts
- Richard Rodgers
- Richard Rodney Bennett
- Richard Roxburgh
- Richard Stallman
- Richard Taylor (mathematician)
- Richard Virenque
- Richard von Weizsäcker
- Richard Wagner
- Richie Benaud
- Richmond Park
- Richmond railway station, Melbourne
- Richmond, Victoria
- Richmond, Virginia
- Richter scale
- Rick Astley
- Rick Perry
- Rick Riordan
- Rick Ross
- Rick Santorum
- Rick Trevi
- Rick Victor
- Rickard Fagerlund
- Rickets
- Rickey with the Tuft
- Ricki Lake
- Rickrolling
- Ricky Martin
- Ricky Martin (1991 album)
- Ricky Stenhouse Jr.
- Riding habit
- Riebeckite
- Riemann hypothesis
- Riemann sum
- Rieti
- Rif Dimashq Governorate
- Rifat Hadžiselimović
- Rifle
- Rifling
- Rigging
- Right Livelihood Award
- Right to a fair trial
- Right to an adequate standard of living
- Right to housing
- Right-hand rule
- Right-handedness
- Rigveda
- Riham El Hour
- Rihanna
- Rijksmuseum
- Rikidōzan
- Rikuzentakata, Iwate
- Riley County, Kansas
- Rima River
- Ring
- Ring of Brodgar
- Ring of Steel (London)
- Ring the Alarm
- Ring-necked snake
- Ringed seal
- Rings of Jupiter
- Rings of Neptune
- Rings of Rhea
- Rio (movie)
- Rio de Janeiro
- Rio de Janeiro (state)
- Río de la Plata
- Río Limpio, Elías Piña
- Río Negro (Uruguay)
- Río Negro Department
- Rio Rancho, New Mexico
- Riojasaurus
- Riot Games
- Rip Van Winkle
- Ripon
- Rise Against
- Rise and Fall, Rage and Grace
- Risotto
- Rita Mae Brown
- Rita Moreno
- Rita Ora
- Rita Williams-Garcia
- Rites of passage
- Ritual purification
- River
- River Camel
- River dolphin
- River Fal
- River Fowey
- River Hull
- River Humber
- River Irwell
- River Liffey
- River Mersey
- River Ocoa
- River Parrett
- River Severn
- River Song (Doctor Who)
- River Tamar
- River Teifi
- River Thames
- River Trent
- River Wandle
- River Ystwyth
- Rivera Department
- Riverdale (2017 TV series)
- Riverside Stadium
- Riverside, California
- Rivet
- Rizal state
- Rizvan Utsiyev
- RM4SCC
- RMS
- RMS Titanic
- RNA
- RNA interference
- RNA polymerase
- RNA splicing
- RNA virus
- Road
- Road bicycle racing
- Road Town
- Road Warrior Hawk
- Roanne
- Roanoke Colony
- Roaring Twenties
- Rob Bironas
- Rob Bourdon
- Rob Ford
- Rob Halford
- Rob Paulsen
- Rob Portman
- Rob Reiner
- Robbie Coltrane
- Robbie Keane
- Robbie Savage
- Robbie Williams
- Robert Altman
- Robert Baker
- Robert Bakker
- Robert Blake (admiral)
- Robert Boyle
- Robert Broom
- Robert Browning
- Robert Byrd
- Robert College
- Robert Cormier
- Robert Costanza
- Robert Curthose
- Robert De Niro
- Robert Duvall
- Robert E. Lee
- Robert Edwards
- Robert Esche
- Robert Eugene Bush
- Robert Falcon Scott
- Robert Ford
- Robert Frost
- Robert G. Heft
- Robert Gascoyne-Cecil, 3rd Marquess of Salisbury
- Robert Graves
- Robert Grubbs