- R ... rabbit hair
- Rabbit Hodges ... Races of Europe: A Sociological Study, The
- Racetrack Playa ... raḍāʿ
- Radbod ... radiation laws
- radiation measurement ... Radio Luxembourg
- Radio Luxembourg: Groundbreaking Belgian Broadcaster ... Radisson, Pierre-Esprit
- radium ... Rafflesiaceae
- Rafi ... Rahab
- Rahabi, David Ezekiel ... Railway Station Man, The
- railways, national ... Raintree County
- Rainulf ... Rajarata
- Rajaratnam, Raj ... Rakovsky, Khristian Georgiyevich
- Rakovy korpus ... Rama VII
- Rama VIII ... Rambo: First Blood Part II
- Rambo: Last Blood ... ramon
- Ramon Berenguer Cap d’Estopes ... Ramses X
- Ramses XI ... Randall, Samuel Jackson
- Randall, Tony ... Rangertone
- rangga ... Ranunculus peltatus
- Ranunculus repens ... Rapier, James Thomas
- Rapin, René ... Rashba
- Rashbaz ... Rastrelli, Bartolomeo Francesco
- Rastrelliger ... Ratingen Swimming Pool
- ratio ... Ratushinskaya, Irina Georgiyevna
- Ratzel, Friedrich ... raw silk
- raw sugar ... Raymond IV
- Raymond of Burgundy ... RCA Victor
- RCA VideoDisc ... Reactor Safety Study
- reactor system ... Real IRA
- Real Irish Republican Army ... Reason and Sensuality
- Reason for the Fatherland ... receiver
- receiver tube ... Réclusion solitaire, La
- recoding ... Recovery
- Recovery of Belief, The ... Red Army Faction
- Red Army Fraction ... red flyer
- Red Fork ... Red Queen
- Red Queen hypothesis ... Red Violin, The
- Red Volta River ... Reddick, Lance
- Reddick, Tyler ... redshift controversy
- Redshirt ... Reed, Jim
- Reed, Jimmy ... Referent
- referential integrity ... Reform, War of the
- Reforma, La ... regency
- Regency Crisis ... regional enteritis
- Regional Fisheries Management Organization ... regular plural
- regular polygon ... Reichenbach, Treaty of
- Reichenbachfälle ... reindeer sacrifice
- Reindl, Lujza ... reja
- Rejang ... relay race
- relazione ... Religious Freedom Restoration Act
- religious icon ... Remember
- Remember (Walking in the Sand) ... Renaissance Scholasticism
- Renaissance Theatre Company ... René I
- René Magritte Museum ... Rentschler, Frederick B.
- renunciation ... Report to the County of Lanark
- Report to the Secretary on the Acquiescence of This Government in the Murder of Jews ... Republic of Korea Army
- Republic Of Love, The ... Requiem
- Requiem ... reserve
- Reserve Bank of Australia ... Resistencia
- Resistência Nacional Moçambicana ... respiratory syncytial virus infection
- respiratory system ... restriction enzyme
- restriction, axiom of ... reticulopodium
- reticulospinal tract ... Return of Martin Guerre, The
- Return of Quetzalcoatl, The ... Revelation
- Revelation Film Festival ... reversible protein phosphorylation
- reversible toxic response ... Revolutionary United Front/Sierra Leone
- Revolutionary War ... Reynolds, Mary Ellen
- Reynolds, Mary Frances ... Rhamnus purshiana
- Rhamphichthyidae ... Rheum rhabarbarum
- rheumatic chorea ... Rhipidistia
- rhipidoglossan radula ... rhodium
- Rhodium Group ... Rhyacotritonidae
- Rhyl ... rib cage
- rib knit ... Ricci, Frank
- Ricci, Matteo ... Richard
- Richard B. Russell Lake ... Richardson, H.H.
- Richardson, Henry Handel ... Richter, Eugen
- Richter, Franz Xaver ... Ridder, Alfons De
- Riddick ... Riemann integral
- Riemann surface ... Riggs, Elmer
- Riggs, Robert Larimore ... rigsar
- Rigsråd ... Rima Hyginus
- Rímac ... Ring, The
- Ring, The ... Rio de Janeiro
- Rio de Janeiro 2016 Olympic Games ... Rio Uruguai
- Río Uruguay ... RIS
- Risālah al-muḥīṭīyya ... Ritchie of Dundee, Charles Thomson Ritchie, 1st Baron
- Ritchie, Charles Thomson Ritchie, 1st Baron ... Rive, Richard Moore
- Rivea corymbosa ... Rivers, Richard Wydeville
- Rivers, Richard Wydville ... RNA interference
- RNA polymerase ... Roan, Chappell
- Roanne ... Robert Duncan in San Francisco
- Robert E. Lee ... Roberts, John Glover, Jr.
- Roberts, Joseph Jenkins ... Robin Woman, The
- robin’s pincushion ... Robinsonville
- Robiquet, Pierre-Jean ... Rochelle, Pierre Drieu La
- Rochensalm ... rock maple
- Rock Me to Sleep ... Rocket
- Rocket 88 ... Rod
- rod ... Rodrigues Lobo Soropita, Fernão
- Rodrigues Lobo, Francisco ... Roger Simpson Island
- Roger the Dodger ... Rohrer, Megan
- Rohri Hills ... Rolin, Nicolas
- roll ... Roma
- Roma ... Roman Spring of Mrs. Stone, The
- Roman surface ... Romanovsky Khutor
- Romans of the Decadence, The ... Romero, Carlos Humberto
- Romero, Celedonio ... Rondo bush baby
- Rondon, Cândido ... Rooney, Mickey
- Rooney, Sally ... ropy bread
- roque ... Roscommon
- Roscopoundia ... Rosecrans, William Starke
- Rosedale ... Rosewall, Ken
- Rosewall, Kenneth Ronald ... Ross, Steve
- Ross, Wilbur ... Rostrhamus sociabilis
- Rostroconchia ... rote learning
- Rote Rummel Revue ... Rotorua Museum of Art and History
- Rotorua, Lake ... Round City, the
- round dance ... Rouvier, Maurice
- Rouvroy, Claude-Henri de ... Roxbury
- Roxbury Latin School ... Royal Commission on Historical Monuments
- Royal Commission on the Press ... Royal Palace
- Royal Palace ... Rozhestvensky, Zinovy Petrovich
- Rozier, Jean-François Pilâtre de ... Ruanda language
- Ruanda-Urundi ... Rubruquis, Wilhelmus
- Rubtab ... Rudman, Warren Bruce
- Rudnicki, Adolf ... Rufus
- Rufus, Lucius Verginius ... Rukeyser, Louis
- Rukeyser, Muriel ... Rumble Fish
- Rumble in the Jungle ... Rundgren, Todd
- Rundi ... rupicaprin
- Rupicaprini ... Rusk, Howard
- Rusk, Howard Archibald ... Russian Album, The
- Russian alphabet ... Rust, Frances
- Rust, Samuel ... Rutland
- Rutland County Grammar School ... Ryan, Lucy
- Ryan, Lynn Nolan, Jr. ... Ryukyu mouse
- Ryukyu Trench ... Rzhev
