Feigenbaum is a German surname meaning "fig tree". Notable people with the surname include:Armand V. Feigenbaum (1920–2014), American quality control expert
B. J. Feigenbaum (1900–1984), American legislator and lawyer
Clive Feigenbaum, stamp dealer
Edward Feigenbaum, American computer scientist known as the "father of expert systems"
Eran Feigenbaum, Israeli information security expert and mentalist
Joan Feigenbaum, American computer scientist
Juliusz Feigenbaum (1872–1944), father of Polish record industry, founder of the company Syrena Record
Mitchell Feigenbaum (1944–2019), American mathematical physicist
William M. Feigenbaum (1886–1949), American politician from New York
Yehoshua Feigenbaum, Israeli footballer