Feigenbaum is a German surname meaning "fig tree". Notable people with the surname include:
Armand V. Feigenbaum (April 6, 1922 – November 13, 2014), American quality control expertClive Feigenbaum, stamp dealerEdward Feigenbaum (born 1936), American computer scientist known as the "father of expert systems"Joan Feigenbaum (born 1958), American computer scientistMitchell Feigenbaum (born 1944), American mathematical physicistWilliam M. Feigenbaum (1886–1949), New York assemblyman 1918Yehoshua Feigenbaum (born 1947), Israeli footballer