R
- Lewis Radcliffe
- Constantine Samuel Rafinesque
- Constant A. Récluz (1797–1873), from France
- Lovell Augustus Reeve
- Harald Alfred Rehder (1907–1996), from the USA
- Lois Corea Rehder (1911–1988), from the USA, spouse of Harald Alfred Rehder
- Otto von Retowski (1849–1925), from Poland/Russia
- Gotthard Richter - from Senckenberg Museum, Frankfurt am Main, Germany (retired in 1990). Interested in pelagic gastropods.
- Hendrik van Rijgersma
- Robert Robertson (1934–20??) from the UK and USA
- Guy Coburn Robson
- Jean-Pierre Rocroi
- Peter Friedrich Röding
- Thomas Rogers (biologist) (1827–1901), from Great Britain
- Emilio Rolán from Spain; father (born 1935) is Emilio Rolán Mosquera, son (born 1965) is Emilio Alvarez Rolán, both malacologists
- Caroline E. Rooney
- Landon Timmonds Ross, Jr.
- Gary Rosenberg (1959–) from the USA
- William B. Rudman
- John Ruskin
- Vasiliy E. Ruzhentsev
Read more about this topic: Malacologist