Two ships of the Royal Navy have been named HMS P38.
HMS P38 was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness.
The Lockheed P-38 Lightning is a World War II-era American piston-engined fighter aircraft.
The Mitchell Wing P-38, also called the Lightning, is an American ultralight aircraft that was designed by Jim Mead and produced by Mitchell Aircraft Corporation.
The P-38, developed in 1942, is a small can opener that was issued in the canned field rations of the United States Armed Forces from World War II to the 1980s.
P38 mitogen-activated protein kinases are a class of mitogen-activated protein kinases (MAPKs) that are responsive to stress stimuli, such as cytokines, ultraviolet irradiation, heat shock, and osmotic shock, and are involved in cell differentiation, apoptosis and autophagy.
Papyrus 38 (in the Gregory-Aland numbering), designated by \mathfrak38, is an early copy of part of the New Testament in Greek.
The Walther P38 (originally written Walther P.38) is a 9 mm semi-automatic pistol that was developed by Carl Walther GmbH as the service pistol of the Wehrmacht at the beginning of World War II.