USS Maryland (BB-46), also known as "Old Mary" or "Fighting Mary" to her crewmates, was a Colorado-class battleship. She was the third ship of the United States Navy to be named in honor of the seventh state. She was commissioned in 1921, and serving as the flagship of the fleet, cruised to Australia, New Zealand, and Brazil.

The Colorado-class battleships were a group of four United States Navy super-dreadnoughts, the last of its pre-Treaty battleships. Designed during World War I, their construction overlapped the end of that conflict and continued in its immediate aftermath. Though all four keels were laid, only three ships entered service: Colorado, Maryland, and West Virginia. Washington was over 75% completed when she was canceled under the terms of the Washington Naval Treaty in 1922. As such, the 16" gun Colorado-class ships were the last and most powerful battleships built by the U.S. Navy until the North Carolina class entered service on the eve of World War II.