Alfred Cort Haddon, Sc.D., FRS, FRGS FRAI (24 May 1855 – 20 April 1940) was an influential British anthropologist and ethnologist. Initially a biologist, who achieved his most notable fieldwork, with W. H. R. Rivers, Charles Gabriel Seligman and Sidney Ray on the Torres Strait Islands. He returned to Christ's College, Cambridge, where he had been an undergraduate, and effectively founded the School of Anthropology. Haddon was a major influence on the work of the American ethnologist Caroline Furness Jayne.