The shelling of Port Gregory took place on 28 January 1943 during World War II. The attack was conducted by the Japanese submarine I-165 under the command of Lieutenant Commander Tatenosuke Tosu as part of the attempts to divert Allied attention away from the evacuation of Guadalcanal in the Solomon Islands. None of the ten shells fired at Port Gregory caused any damage, and the attack was not noticed by the Allied naval authorities until a radio signal sent by Tosu was intercepted and decoded a week later.