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Proclus | 5th-century Greek Neoplatonist philosopher |
| PF | Professor Farnsworth | fictional character from Futurama |
| PF | Professor Frink | fictional character from The Simpsons |
| QSO | Queen Seondeok of Silla | queen-regnant of Silla |
| RR | Raffaela Raab | Austrian doctor and vegan activist |
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Ralph Abraham | American mathematician (1936–2024) |
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Ram Dass | American spiritual teacher, author and psychologist |
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Ramon Magsaysay | president of the Philippines from 1953 to 1957 |
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Ray Blanchard | American-Canadian sexologist (born 1945) |
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Raymond Moody | American psychologist |
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R. D. Laing | unorthodox Scottish psychiatrist |
| RS | Rebecca Saxe | Canadian cognitive neuroscientist |
| RR | Reed Richards | fictional character from The Fantastic Four: First Steps |
| RR | Reed Richards | fictional character from Fantastic Four |
| RR | Reed Richards | fictional character from Fantastic Four |
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Reynold A. Nicholson | British orientalist (1868–1945) |
| RAE | Richard Arnold Epstein | American physicist |
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Richard Bandler | American author and trainer in the field of self-help |
| RC | Richard Carlson | Author, psychotherapist and motivational speaker (1961-2006) |
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Richard Garriott | British video game developer, astronaut and entrepreneur |
| RH | Richard Herrnstein | American psychologist (1930–1994) |
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Richard Lewontin | American evolutionary biologist and mathematician (1929–2021) |
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Richard Pankhurst | British botanist and academic (1940-2013) |
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Richard S. Hamilton | American mathematician (1943–2024) |
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Robert A. Millikan | American physicist (1868–1953) |
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Robert Dilts | American coach, consultant, researcher and writer and co-developper of Neuro-Linguistic Programmation (NLP) |
| RFM | Robert F. Myers | soft redirect to Wikispecies |
| RFP | Robert F. Peterson | psychologist |
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Robert Langlands | Canadian mathematician |
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Robert Lanza | American stem cell researcher (born 1956) |
| RLP | Robert L Peach | researcher |
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Robert Mercer | American computer scientist and businessman |
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Roberto Assagioli | Italian psychiatrist and pioneer (1888-1974) |
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Robert Owen | Welsh textile manufacturer and social reformer (1771–1858) |
| RSD | Robert S. de Ropp | Biochemist; mental-health researcher; cancer researcher; American psychedelic researcher; small-scale farmer; human-potentials writer |
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Robert S. Mulliken | American physicist, chemist and botanical collector (1896 - 1986) |
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Robert Taylor | American computer scientist (1932–2017) |
| RB | Roger Boisjoly | American aerospace engineer (1938–2012) |
| RW | Roger Woolger | English Psychotherapist |
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Rollo May | American psychologist (1909–1994) |
| R | Romilly | fictional character from Interstellar |
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Ronald Coase | British economist and Nobel laureate (1910–2013) |
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Ronald Wayne | American engineer and co-founder of Apple Inc. |
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Ron White | American comedian |
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Rosa Luxemburg | Polish-German Marxist revolutionary (1871–1919) |
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Ross Ulbricht | American founder and administrator of the illicit online marketplace the Silk Road |
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Rudolf Mössbauer | German nuclear physicist and Noble Prize in Physics |
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Rudolf Rocker | German anarcho-syndicalist writer and activist (1873-1958) |
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Sadi Carnot | 5th president of France (1837–1894) |
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Sahra Wagenknecht | German politician (born 1969) |