Mainetti is an Italian surname. Notable people with the surname include: José María Mainetti (1909–2006), Argentine physician, surgeon and oncologist Maria Laura Mainetti (1939–2000), Italian Catholic sister and murder victim Stefano Mainetti (born 1957), Italian composer and conductor Valter Mainetti (born 1947), Italian businessman Veronica Mainetti (born 1978), Italian chief executive Italian-language surnames