South Dakota-class Battleship

Ships in class: USS South Dakota, USS Indiana, USS Massachusetts, USS Alabama

The South Dakota class was a group of four fast battleships built by the United States Navy. They were the second class of battleships to be named after the 40th state; the first were designed in the 1920s and canceled under the terms of the Washington Naval Treaty.

They were more compact and better protected than the preceding North Carolina class, but had the same main battery, nine 16"/45 caliber Mark 6 guns in three-gun turrets. The ships can be visually distinguished from the earlier vessels by their single funnel, compared to twin funnels in the North Carolinas. According to authors William Garzke and Robert Dulin, the South Dakota design was the best "treaty battleship" ever built.