Constanzo is an Italian given name or surname. Notable people with the name include:
Given name Constanzo Beschi (1680–1747), Italian jesuit priest, missionary, and Tamil language littérateur Constanzo Festa (c. 1485/1490–1545), Italian composer Constanzo Mangini (1918–1981), Italian ice hockey player
Surname Adolfo Constanzo (1962–1989), American serial killer, drug trafficker, and cult leader Carmine Constanzo (died 1997), actor and father of Robert Costanzo Steve Constanzo (born 1988), Australian basketball player Ted Constanzo (born ), American former football player
See also Costanzo