Heydt

Heydt is a surname. Notable people with the surname include:
 * 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 Sjöwall/Wahlöö's novel The Terrorists.