Isonami (磯波, "Breakers" or "Surf")[1] was the ninth of twenty-four Fubuki-class destroyers, built for the Imperial Japanese Navy following World War I.

Construction of the advanced Fubuki-class destroyers was authorized as part of the Imperial Japanese Navy's expansion program from fiscal 1923, intended to give Japan a qualitative edge with the world's most modern ships.

At the time of the attack on Pearl Harbor, Isonami was assigned to Destroyer Division 19 of Desron 3 of the IJN 1st Fleet, and had deployed from Kure Naval District to the port of Samah on Hainan Island.

From 4 December 1941 to 30 January 1942 Isonami was part of the escort for the heavy cruisers Suzuya, Kumano, Mogami, and Mikuma out of Samah and Camranh Bay, French Indochina in support of Malaya, Banka-Palembang and Anambas Islands invasion operations.

While returning from the battle, she was damaged in a collision with Uranami and limped back to Yokosuka Naval Arsenal for repairs, which were not completed to the end of July.