Feigenbaum or Faigenboym (Hebrew: פייגנבוים) is a Jewish (Ashkenazic) ornamental name meaning 'fig tree' in German or Yiddish.
- Armand V. Feigenbaum (born 1922), American quality control expert
- Clive Feigenbaum, Stamp dealer.
- Edward Feigenbaum (born 1936), American computer scientist known as the "father of expert systems"
- Mitchell Feigenbaum (born 1944), American mathematical physicist and discoverer of the Feigenbaum functions and constants
- Yehoshua Feigenbaum (born 1947), former Israeli footballer
- Harvey Feigenbaum, M.D., widely recognized as the "Father of Echocardiography"