USS Missouri belonged to the Iowa class when it hosted Japan’s surrender.
The Iowa-class battleships were the last battleships commissioned by the United States Navy. USS Missouri, designated BB-63, was commissioned in 1944 and served in the Pacific during the final phase of World War II. Its combination of heavy armor, large guns, and high speed made it suitable for operating with fast carrier task forces.
Missouri became famous when the Japanese Instrument of Surrender was signed on its deck in Tokyo Bay on September 2, 1945. Its sister ships included USS Iowa, USS New Jersey, USS Wisconsin, and USS Illinois, although Illinois was never completed as a battleship.
The answer is sometimes confused with Yamato class, Japan’s own class of exceptionally large battleships. Yamato and Musashi were Japanese ships, while Missouri was an American Iowa-class vessel. Missouri later served in the Korean War, was preserved as a museum ship, and remains at Pearl Harbor.