Krenn is a surname. Notable people with the surname include:
Franz Krenn (1816–1897), Austrian composer Gert Krenn, Austrian bobsledder Harald W. Krenn (born 1958), Austrian biologist Kurt Krenn, (1936-2014), Austrian Catholic bishop Sherrie Austin (born Sherrie Krenn), Australian actress and singer Veit Krenn (born 1960), American-born, German pathologist of Austrian origin Werner Krenn (born 1943), Austrian tenor
See also Kren Dominique Crenn, a French chef