Fantoni is an Italian surname. Notable people with the surname include:
Angelo Fantoni (1903–1992), Italian priest and exorcist Barry Fantoni (1940–2025), English writer, cartoonist, and jazz musician Cesare Fantoni (1905–1963), Italian actor Fulvio Fantoni (born 1963), Italian bridge player Otávio Fantoni (1907–1935), Brazilian-born Italian football player Sergio Fantoni (1930–2020), Italian actor Stefano Fantoni (born 1945), Italian theoretical physicist Silvia Filippini-Fantoni (born 1974), Italian US-based museum director