Pettet is a surname. Notable people with the surname include:
Brette Pettet (born 1999), Canadian ice hockey player Clayton Pettet (born 1994 or 1995), English singer and performance artist known professionally as Babymorocco Darren Pettet (born 1975), Australian rugby league footballer Isabella M. Pettet (1848–1912), American physician Joanna Pettet (born 1942), British actress William Varney Pettet (1858–1938), Canadian politician Yasmin Pettet (born 2001), English television personality