P40

P40 may refer to:

Proteins

 * Interleukin-12 subunit beta
 * Neutrophil cytosolic factor 4
 * Ribosomal protein SA

Vehicles

 * BRAZILIAN PATROL BOAT Grajaú
 * Carro Armato P 40, an Italian tank
 * Curtiss P-40 Warhawk, an American military aircraft
 * Percival Prentice, a British trainer aircraft
 * Pottier P.40, a French sport aircraft
 * P40 Genesis, an American locomotive

Other uses

 * Huawei P40, a smartphone
 * Kel-Tec P-40, a pistol
 * Nonidet P-40, a detergent
 * P-40 APPLE mine, a Vietnamese mine
 * P-40 radar, a Soviet radar
 * Papyrus 40, a biblical manuscript
 * Phosphorus-40, an isotope of phosphorus
 * ThinkPad P40 Yoga, a laptop
 * P40, a Nissan P engine