1943
Pollack's fifth war patrol was again spent in waters off the Japanese home islands. After departing Pearl Harbor 31 December, she sighted only one target before terminating her fifth war patrol at Pearl Harbor, 10 February 1943.
Pollack spent her sixth war patrol between the Gilbert and Marshall Islands. She put to sea from Pearl Harbor 6 March and intercepted a freighter in the sealane between Jaluit and Makin Atolls on the afternoon of 20 March, damaging her with one of three torpedoes. Pollack ended her sixth war patrol at Midway 18 April.
Underway for her seventh war patrol, Pollack departed Midway 10 May to reconnoiter Ailuk Atoll and Wotje Atoll, then patrolled to the south and west towards Schischmarev Strait. On 18 May she torpedoed and sank 3110-ton ex-gunboat Terushima Maru. Off Jaluit Atoll the next afternoon, she torpedoed and sank 5350-ton converted light cruiser Bangkok Maru. She returned to Pearl Harbor 25 June.
Sailing 20 July, Pollack spent her eighth war patrol off the east coast of Kyūshū, Japan. On 6 August she scored a torpedo hit on one ship in a convoy. Early on 27 August 1943, Pollack picked out one of five merchant ships off the coast of Kyūshū and pressed home an attack which sank 3520-ton passenger/cargo ship Taifuku Maru. On 3 September she sank 3,521-ton cargo ship Tagonoura Maru. She returned to Pearl Harbor 16 September.
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