USS Torsk, hull number SS-423, is a Tench-class submarine built for the United States Navy during World War II.

Torsk was laid down at the Portsmouth Navy Yard in June 1944, was launched in September that year, and commissioned in December.

In 1945, Torsk made two war patrols off Japan, sinking one cargo vessel and two coastal defense frigates.

The latter of these, torpedoed on 14 August 1945, was the last enemy ship sunk by the United States Navy in World War II.

The Tenches, the culmination of early wartime experiences, were the last submarine class to be built by the United States Navy during the war.

The Tench-class submarines were powered by four Fairbanks-Morse Model 38D8-⅛ 10-cylinder opposed piston diesel engines driving electrical generators.

[6] The keel for Torsk was laid down at the Portsmouth Navy Yard on 7 June 1944, and the completed hull was launched on 6 September.

Beginning on 31 December, she began training exercises that lasted until 11 February 1945; five days later she sailed to Port Everglades, Florida, where she conducted anti-submarine experiments.

The vessel remained there only briefly, and on 20 February, she got underway for the Pacific Ocean, passing through the Panama Canal and arriving in Hawaii on 23 March.

[7] Torsk cruised to Guam and then proceeded to Kii Suido in the Japanese home islands, arriving there on 11 May.

Two days later, she located a 700 long tons (710 t) freighter off Kobe Saki; she fired four torpedoes but again missed her target.

While patrolling off Dogo Island the next morning, she located a small freighter and sank her with a submerged torpedo attack.

The torpedo struck the ship and blew a hole in the stern, bending it up at a 30-degree angle and causing it to rapidly sink.

[7] At around 12:00, a second Kaibōkan arrived in the area to hunt for Torsk; the latter fired a second Mark 28 torpedo and then dove deep to evade any depth charge attacks.

[7] The vessel underwent the Fleet Snorkel conversion in early 1952, after which she went on another Mediterranean deployment in the middle of the year.

[7] Torsk resumed her Mediterranean deployments in the 1960s, which included a joint training exercise, "New Broom X", with fleet units of British Commonwealth navies.

[8] The Torsk Volunteer Association works hand-in-hand with Historic Ships in Baltimore to provide skilled restoration and maintenance activities for the vessel.