Thum is a surname. Notable people with the surname include:
Christian Thum (d. 1655), German-born Swedish actor and theater director Denny Thum (born 1952), American football executive Gregor Thum (born 1967), German historian Joe Thum (fl. 1880s–1910s), American bowler Jon Thum (fl. 1990s–2010s), visual effects artist Patty Prather Thum (1853–1926), American artist Peter Thum, American entrepreneur and businessman Robert Thum (fl. 1920s–1930s), Austrian table tennis player Steffen Thum (born 1988), German composer Thum Ping Tjin (born 1979), also known as PJ Thum, is a Singaporean historian and journalist William Thum (1861–1941), Mayor of Pasadena, California
See also Thum (disambiguation) Thumm