William Ramsay, (born 1852), Scottish chemist
Marij Rebek, chemist
Henri Victor Regnault (1810–1878), French chemist and physicist
Tadeus Reichstein, (1897–1996), chemist, 1950 Nobel Prize in Physiology or Medicine
Stuart A. Rice, (born 1932), physical chemist
Ellen Swallow Richards, (1842–1911), industrial and environmental chemist
Jeremias Benjamin Richter (1762–1807), German chemist
Martin Rodbell (1925-1998) American biochemist, winner of 1994 Nobel Prize in Medicine
F. Sherwood Rowland (1927- ) American chemist, winner of 1995 Nobel Prize in Chemistry
Ernest Rutherford (1871-1937), Father of Nuclear Physics, 1908 Nobel Prize in Chemistry
Leopold Ruzicka, (1887–1976), 1939 Nobel Prize in Chemistry
