USS Trout (SS-202) was the fifth Tambor-class submarine commissioned in the United States Navy, serving in the Pacific from 1941 to 1944. She received 11 battle stars for World War II service and Presidential Unit Citation for her second, third, and fifth war patrols. Trout also delivered ammunition to the besieged American forces on Corregidor and brought out 20 tons of gold bars and silver pesos from the Philippine currency reserve to Pearl Harbor. During 1941, she was used as a target by a series of tests determining the vulnerability of submarines to depth charge attacks.

The Tambor-class submarine was a United States Navy submarine design, used primarily during World War II. They were the USN's first fully successful fleet submarine, and began the war close to the fighting. Six of the class were in Hawaiian waters or the Central Pacific on 7 December 1941, with Tautog at Pearl Harbor during the attack. They went on to see hard service; seven of the twelve boats in the class were sunk before the survivors were withdrawn from front-line service in early 1945; this was the highest percentage lost of any US submarine class. Tautog was credited with sinking 26 ships, the largest number of ships sunk by a US submarine in World War II. The Tambors attained the top speed of 21 knots (39 km/h) and range of 11,000 nautical miles (20,000 km) of the preceding Sargo class, and improvements included six bow torpedo tubes, a more reliable full diesel-electric propulsion plant, and improved combat efficiency with key personnel and equipment relocated to the conning tower. In some references, the Tambors are called the "T Class", and SS-206 through SS-211 are sometimes called the "Gar class".