USS PT-320 was a United States Navy motor torpedo boat, one of the small, fast craft the Navy numbered in the PT series and sent to work close to the enemy in the Pacific.
Her recorded wartime service is tied to a single night in the southern Philippines. On the night of 24–25 October 1944 she was at sea in Surigao Strait, one of the motor torpedo boats keeping station there as the larger action of that night developed.
In the Battle of Surigao Strait on 25 October 1944, PT-320 was with the motor torpedo boat patrol. The boats assigned to that strait that night numbered thirty-nine, and she was one of them, holding a place in the screen of small craft spread across the water.
What is set down for her hull is that patrol. PT-320 was among the motor torpedo boats on station in Surigao Strait through the night of 24–25 October 1944, when the Battle of Surigao Strait was fought.