R. Gordon Wasson (September 22, 1898 - December 23, 1986) was an American international banker, amateur mycologist, and author whose interest in mushrooms led him to Mexico in 1953 where he eventually met the Mazatec curandera (shaman, or spirit-healer), Maria Sabina (1898 - 1985), who initiated Wasson into the experience of entheogenic psilocybin mushrooms (Psilocybe caerulescens var. Psilocybe caerulescens var. mazatecorum).

Wasson was married to Valentina Guercken.