Charles Robert Richet (25 August 1850 – 4 December 1935) was a French physiologist who initially investigated a variety of subjects such as neurochemistry, digestion, thermoregulation in homeothermic animals, and breathing. He won the Nobel Prize "in recognition of his work on anaphylaxis" in 1913. He also presided over the French Eugenic Society from 1920 to 1926.