Heydt is a surname. Notable people with the surname include: Colin Heydt, American philosopher Dorothy J. Heydt, American writer Francis Heydt (1918–2008), American swimmer Gerald T. Heydt, American electrical engineer Louis Jean Heydt (1903–1960), American actor Martin Heydt, American businessman
Fictional characters with the name include: Reinhard Heydt, the antagonist of the prolific terrorist cell in the Maj Sjöwall & Per Wahlöö novel The Terrorists.
See also Von der Heydt