Frenz is a surname. Notable people with the surname include:
Horst Frenz (1912–1990), German-American literary scholar and professor Richardt Frenz (born 1992), South African cricketer Ron Frenz (born 1960), American comic book artist Uwe Frenz (born 1969), German judoka
See also The Frenz Experiment, a 1988 album by The Fall