Hemmer is a surname. Notable people with the surname include:
Bill Hemmer (born 1964), American television news anchor
Frank Hemmer (born 1963), West German-German slalom canoeist
Gerardo Hemmer (1971–1995), Mexican actor
Hans Ritter von Hemmer, (1869–1931), officer in the Royal Bavarian Army, Knight Commander of the Military Order of Max Joseph
Jarl Hemmer (1893–1944), Finland-Swedish author from Vaasa, Finland
Mari Hemmer (born 1983), Norwegian long-track speedskater
Martin Hemmer, German slalom canoeist who competed in the early 1990s
Rafael Lozano-Hemmer (born 1967), Mexican-Canadian electronic artist
