Four commissioned ships of the United States Navy have borne the name USS Louisiana in honor of the 18th state.

The first Louisiana was a a sloop that served in the War of 1812.

The second Louisiana was a sidewheel steamer that served in the American Civil War.

The third Louisiana was a Connecticut-class battleship.

The fourth ship to be given the name Louisiana was a Montana-class battleship cancelled before her keel was laid down.

The fourth ship to be commissioned Louisiana was an Ohio-class submarine.

See also CSS Louisiana.