"Seeking the Magic Mushroom" is a 1957 photo essay by amateur mycologist Robert Gordon Wasson describing his experience taking psilocybin mushrooms in 1955 during a Mazatec ritual in Oaxaca, Mexico. Wasson was one of the first Westerners to participate in a Mazatec ceremony and to describe the psychoactive effects of the Psilocybe species. The essay contains photographs by Allan Richardson and illustrations of several mushroom species of Psilocybe collected and identified by French botanist Roger Heim, then director of the French National Museum of Natural History. Wasson's essay, written in a first person narrative, appeared in the May 13 issue of Life magazine as part three of the "Great Adventures" series.

Psilocybe is a genus of gilled mushrooms, growing worldwide, in the family Hymenogastraceae. Many species contain the psychedelic compounds psilocybin and psilocin.