SS Patrick S. Mahony was a Liberty ship built in the United States during World War II.

Patrick S. Mahony was laid down on 30 December 1944, under a Maritime Commission (MARCOM) contract, MC hull 2400, by J.A.

Jones Construction, Brunswick, Georgia; she was sponsored by Mrs. L.A. Graves, and launched on 10 February 1945.

On 13 September 1945, she was laid up in the National Defense Reserve Fleet, in the James River Group.

On 10 December 1947, she was laid up in the National Defense Reserve Fleet, in Wilmington, North Carolina.