Editing List of physicists (section)

== R ==
*[[Raúl Rabadán]] – United States
*[[Gabriele Rabel]] – Austria, United Kingdom (1880–1963)
*[[Isidor Isaac Rabi]] – Austria, United States (1898–1988) Nobel laureate
*[[Giulio Racah]] – Italian-Israeli (1909–1965)
*[[James Rainwater]] – United States (1917–1986) Nobel laureate
*[[Mark G. Raizen]] – New York City United States (born 1955)
*[[Alladi Ramakrishnan]] – India (1923–2008)
*[[Chandrasekhara Venkata Raman]] – India (1888–1970) Nobel laureate
*[[Edward Ramberg]] – United States (1907–1995)
*[[Carl Ramsauer]] – Germany (1879–1955)
*[[Norman Foster Ramsey, Jr.]] – United States (1915–2011) Nobel laureate
*[[Lisa Randall]] – United States (born 1962)
*[[Riccardo Rattazzi]] – Italy (born 1964)
*[[Lord Rayleigh]] – U.K. (1842–1919) Nobel laureate
*[[René Antoine Ferchault de Réaumur]] – France (1683–1757)
*[[Sidney Redner]] – Canada, United States (born 1951)
*[[Martin Rees, Baron Rees of Ludlow|Martin John Rees]] – U.K. (born 1942)
*[[Hubert Reeves]] – Canada (born 1932)
*[[Tullio Regge]] – Italy (1931–2014)
*[[Frederick Reines]] – United States (1918–1998) Nobel laureate
*[[Louis Rendu]] – France (1789–1859)
*[[Osborne Reynolds]] – U.K. (1842–1912)
*[[Owen Willans Richardson]] – U.K. (1879–1959) Nobel laureate
*[[Robert Coleman Richardson]] – United States (1937–2013) Nobel laureate
*[[Burton Richter]] – United States (1931–2018) Nobel laureate
*[[Floyd K. Richtmyer]] – United States (1881–1939)
*[[Robert D. Richtmyer]] – (1910–2003)
*[[Charlotte Riefenstahl]] – Germany (1899–1993)
*[[Nikolaus Riehl]] – Germany (1901–1990)
*[[Adam Riess]] – United States (born 1969) Nobel laureate
*[[Karl-Heinrich Riewe]] – Germany
*[[Walther Ritz]] – Switzerland (1878–1909)
*[[Étienne-Gaspard Robert]] – Belgium (1763–1837)
*[[Heinrich Rohrer]] – Switzerland (1933–2013) Nobel laureate
*[[Joseph Romm]] – United States (born 1960)
*[[Wilhelm Röntgen|Wilhelm Conrad Röntgen]] – Germany (1845–1923) Nobel laureate
*[[Clemens C. J. Roothaan]] – Netherlands (1918–2019)
*[[Nathan Rosen]] – United States, Israel (1909–1995)
*[[Marshall Rosenbluth]] – United States (1927–2003)
*[[Yasha Rosenfeld]] – Israel (1948–2002)
*[[Carl-Gustav Arvid Rossby]] – Sweden, United States (1898–1957)
*[[Bruno Rossi]] – Italy, United States (1905–1993)
*[[Joseph Rotblat]] – Poland, U.K. (1908–2005)
*[[Carlo Rovelli]] – Italy (born 1956)
*[[Mary Laura Chalk Rowles]] – United States (1904–1996)
*[[Subrata Roy (scientist)]] – India, United States
*[[Carlo Rubbia]] – Italy (born 1934) Nobel laureate
*[[Vera Rubin]] – United States (1928–2016)
*[[Serge Rudaz]] – Canada, United States (born 1954)
*[[David Ruelle]] – Belgium, France (born 1935)
*[[Ernst Ruska|Ernst August Friedrich Ruska]] – Germany (1906–1988) Nobel laureate
*[[Ernest Rutherford]] – New Zealand, U.K. (1871–1937)
*[[Johannes Rydberg|Janne Rydberg]] – Sweden (1854–1919)
*[[Martin Ryle]] – U.K. (1918–1984) Nobel laureate