SS Mary Ball was a Liberty ship built in the United States during World War II.

She was named after Mary Ball, the mother of George Washington, the first President of the United States.

Mary Ball was laid down on 20 July 1943, under a Maritime Commission (MARCOM) contract, MC hull 1534, by J.A.

On 20 June 1946, she was laid up in the National Defense Reserve Fleet, in Mobile, Alabama.

On 28 October 1971, she was sold, along with 13 other ships, for $513,800, to Union Minerals and Alloys Corporation, to be scrapped.