Flam is a surname. Notable people with the surname (or its variant Flahm) include:
Abraham Bär Flahm, 19th-century Jewish editor and publisher
Aron Flam (born 1978), Swedish comedian, podcaster, and writer, and actor
Faye Flam (born c. 1964), American science writer
Gila Flam (born 1956), Israeli musicologist, ethnomusicologist, and a librarian, a researcher of Jewish music
Harry Flam (born 1948), Swedish economics professor at Stockholm University
Helena Flam (born 1951), Polish-born sociology professor at the University of Leipzig
Herbert Flam (1928–1980), Jewish-American tennis player
Leopold Flam (1912–1995), Belgian philosopher
Shlomo Flam (died 1813), Volhynian rabbi