Charles Robert Richet (25 August 1850 – 4 December 1935) was a French physiologist at the Collège de France and immunology pioneer. In 1913, he won the Nobel Prize in Physiology or Medicine "in recognition of his work on anaphylaxis". Richet devoted many years to the study of paranormal and spiritualist phenomena, coining the term "ectoplasm". He believed in the inferiority of black people, was a proponent of eugenics, and presided over the French Eugenics Society towards the end of his life. The Richet line of professorships of medical science continued through his son Charles and his grandson Gabriel. Gabriel Richet was also one of the pioneers of European nephrology.
He was born on 25 August 1850 in Paris the son of Alfred Richet. He was educated at the Lycee Bonaparte in Paris then studied medicine at university in Paris.
Richet spent a period of time as an intern at the Salpêtrière hospital in Paris, where he observed Jean-Martin Charcot's work with then so called "hysterical" patients.
In 1887, Richet became professor of physiology at the Collège de France investigating a variety of subjects such as neurochemistry, digestion, thermoregulation in homeothermic animals, and breathing. In 1898, he became a member of the Académie de Médecine. In 1914, he became a member of the Académie des Sciences.
Richet discovered the analgesic drug chloralose with Maurice Hanriot.
Richet had many interests, and he wrote books about history, sociology, philosophy, psychology, as well as theatre and poetry. He was a pioneer in aviation.
He was involved in the French pacifist movement. Starting in 1902, pacifist societies began to meet at a National Peace Congress, often with several hundred attendees. Unable to unify the pacifist forces they set up a small permanent delegation of French Pacifist Societies in 1902, which Richet led, together with Lucien Le Foyer as secretary-general.
Richet, working with Paul Portier, discovered the phenomenon of anaphylaxis. In 1901, they joined Albert I, Prince of Monaco on a scientific expedition around the French coast of Atlantic Ocean.