- R ... rabbit berry
- rabbit hair ... racerunner
- Races of Europe: A Sociological Study, The ... Radarsat-1
- Radasbona ... radiation laws
- radiation measurement ... radio navigation
- Radio New Zealand Ltd. ... radium-228
- radius ... raft foundation
- Raft of the Medusa, The ... Ra?mah ibn Jābir al-Jalāhimah
- Ra?mah, Jabal al- ... rain forest
- rain frog ... raised bread
- Raised Chair with Geese ... rajjuka
- Rajk, László ... Ralov, Kirsten Laura Gnatt
- raloxifene ... Ramanantsoa, Gabriel
- Ramanatha ... Ramessesnakht
- Ramesseum ... Ramphastos
- Ramphastos dicolorus ... Rance River
- Rancé, Armand-Jean Le Bouthillier de ... rangaku
- Rangamati ... Ranoji Sindhia
- Ranong ... Raphia
- Raphia farinifera ... Rasbora
- rasbora ... Rassemblement du Peuple Togolais
- Rassemblement National et Démocratique ... Rathore, Rajyavardhan Singh
- Rathouisiidae ... Rattus osgoodi
- Rattus rattus ... Raw and the Cooked, The
- raw coal ... Raymie Nightingale
- Raymond ... RCA Building
- RCA Corporation ... reactor
- reactor ... real presence
- real property ... Rebagliati, Ross
- Rebaptizer ... recessiveness
- Rechabite ... recombinant DNA
- recombinant human antithrombin ... rectilinear motion
- Recto, Claro Mayo ... red calla lily
- Red Caps ... red lead
- red lechwe ... Red Sorghum Family
- Red Sox ... red-to-yellow soil
- red-wattled lapwing ... redness trope
- Redoble por Rancas ... reed organ
- reed organ ... Reeves, Bass
- Reeves, H. A. ... reflux
- reflux ... regal stop
- Regalecus glesne ... Region of the Rapids
- Region of Unlikeness ... regular delay cap
- Regular Division of the Plane ... Reichenbach, Georg von
- Reichenbach, Hans ... reindeer sacrifice
- Reindl, Lujza ... Rejang language
- Rejected Addresses; or, The New Theatrum Poetarum ... Relenza
- Reles, Abe ... religious movement
- religious music ... remembrancer
- Rememory ... renal hilus
- renal hypertension ... renin-angiotensin system
- Renison Bell ... repeater jamming
- Repeating Island, The ... Repristination Theology
- reprocessed wool ... Republican Peasants’ Nation Party
- Republican People’s Party ... Research and Analysis Wing
- Research and Coordination in Acoustics/Music, Institute for ... residual landform
- residual loss ... Resor, Stanley
- resorcinol ... Reston, James
- Reston, James Barrett ... Réthymno
- Réti, Richard ... Rettl, Martin
- Retton, Mary Lou ... Revelation Perth International Film Festival
- Revelation to John ... revetment
- Review ... Revue de Paris
- Revue de synthèse historique ... Rezé
- Reznikoff, Charles ... Rhazes
- RhD ... Rhine-Hesse Plateau
- Rhine-Main-Danube Canal ... Rhizopodea
- Rhizopogon ... rhombohedral system
- rhombohedron ... Rhythm 10
- rhythm and blues ... Ribes grossularia
- Ribes hirtellum ... Rice, Susan
- Rice, Susan Elizabeth ... Richards, Dickinson Woodruff
- Richards, Ellen Swallow ... Richmond
- Richmond ... Rickman, Alan Sidney Patrick
- Rickman, Thomas ... Ridolfi, Roberto
- Ridsdel, John ... rift volcano
- rifting ... Rights of Man
- Rights of Man and of the Citizen, Declaration of the ... Riley, Teddy
- Riley, Terry ... Ring cycle
- ring dance ... Rio 2016
- Rio All-Suite Casino ... Río Salado, Battle of
- Río San Juan ... Ripuarian
- Ripuarian ... Rita Hayworth and Shawshank Redemption
- Ritalin ... Rive, Auguste-Arthur de La
- Rive, Richard ... riverweed
- riverweed family ... rō-iro
- rō-iro nuri ... robā?ī
- Robā?īyāt ... Robert of Normandy
- Robert T. Stafford Disaster Relief and Emergency Assistance Act ... Robertson Of Brighton, Frederick William
- Robertson Panel ... Robinson, Elizabeth
- Robinson, Esmé Stuart Lennox ... Robustness
- Roby ... Rock Around the Clock
- rock art ... Rock, The
- Rock, The ... Rockford Files, The
- Rockford Peaches ... Rodez
- Rodger, George ... Roemer v. Board of Public Works of Maryland
- Roemer, Ole Christensen ... Rogers, William Penn Adair
- Rogers, William Pierce ... Rokotov, Fyodor Stepanovich
- Rokycana, Jan ... rolling motion
- Rolling Power ... Roman de sapience, Le
- Roman de Thebes ... Romanian Alliance
- Romanian Catholic Church ... Rome, University of
- Rome-Berlin Axis ... Ronaldo, Cristiano
- Ronay, Egon ... Room for Squares
- Room in Brooklyn ... Rope
- Rope of Sand ... Roscelin of Compiègne
- Roscellinus Compen-diensis ... Roseau
- rosebay ... Rosenthal, Manuel
- Rosenthal, Norman ... Ross, Lancelot Patrick
- Ross, Lanny ... Rostov
- Rostov ... Rotblat, Sir Joseph
- ROTC ... Rotomagus
- Rotonda, Villa ... Roume, Philippe
- round ... route cipher
- route orienteering ... Roxas y Acuna, Manuel
- Roxas, Felipe ... royal council
- royal council ... Royal Philharmonic Orchestra
- Royal Philips Electronics NV ... Rozumovsky, Kyrylo
- Rozvi ... rubber boa
- rubber bridge ... Ruby Ridge
- ruby silver ... Rudolf von Rheinfelden
- Rudolf von Schwaben ... Rugendas, Johann Moritz
- Rugg, Harold ... rule of quantifier transformation
- rule of substitution ... Rumney Marsh
- Rumoi ... running-dog pattern
- running-key cipher ... Rusan, Otilia Valeria Coman
- Rusas I ... Russell, John Russell, 1st Earl
- Russell, John Scott ... Russian sturgeon
- Russian Telegraph Agency ... Ruthenian language
- ruthenium ... RV
- RV ... rye whiskey
- Ryedale ... Rzhev
