USS Hancock (AP-3) was a transport ship in the United States Navy. Acquired by the Navy in 1902, she participated in World War I and a number of US military and diplomatic ventures prior to that. She was named for Founding Father John Hancock. Hancock, the third US Navy ship to bear the name, was built in 1879 by J. Elder & Co., Glasgow, Scotland. Formerly Arizona, she was purchased by the War Department during the Spanish–American War and transferred to the Navy 8 November 1902. She was commissioned 20 November 1902.