P-40 (disambiguation)

P 40, P40, p40, or P-40 may refer to:


 * Carro Armato P 40, an Italian World War II tank
 * Curtiss P-40 Warhawk, an American military aircraft
 * P-40 radar, a Soviet radar
 * P-40 APPLE mine, a Vietnamese mine
 * Brazilian patrol boat Grajaú (P40)