HMS P48 was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness. Commissioned on 18 June 1942, she spent most of her career in the Mediterranean Sea. After an initial patrol in the Norwegian Sea, P48 sailed to Gibraltar, then was assigned to the 10th Submarine Flotilla, based in Malta. After an uneventful patrol, she departed port on her last patrol, on 23 December 1942. She is thought to have been sunk two days later whilst attacking an Italian convoy in the Gulf of Tunis heading towards Tunis, from depth charges launched by the Italian torpedo boat Ardente, northwest of the island of Zembra.