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- Simon Ramo (1913) is an American physicist, engineer, and business leader.
- Anatol Rapoport (1911–2007) was a Russian mathematician, psychologist and systems scientist. He is cofounder of the International Society for Systems Science.
- Eberhardt Rechtin (1926–2006) was an American systems engineer and respected authority in aerospace systems and systems architecture.
- Barry Richmond (1947–2002) was an American systems scientist,
- Robert Rosen (1943) is an American biologist and systems thinker
Read more about this topic: List Of Systems Scientists