Pettitt is an English surname of Hiberno-Norman origin. Variant spellings include Pettit and Petitt. People with the surname include:
B. Montgomery Pettitt, American academic Dave Pettitt (born 1972), Canadian voice actor Ellen Pettitt (born 1986), Australian high jumper Florence Louise Pettitt (1918–2006), American opera conductor Garth Pettitt (1932–1992), English civil servant Henry Pettitt (1848–1893), British actor and dramatist John (Ian) Pettitt (1910–1977), Australian politician Peggy Pettitt (born 1950), American actress and playwright Tom Pettitt (1859–1946), American real tennis player
See also Pettitt v Pettitt, a 1970 leading English trusts law case Andy Pettitte (born 1972), American baseball pitcher