The second USS Mystery (ID-2744), often identified as SP-2744, was a minesweeper support ship that served in the United States Navy from 1918 to 1919.

Mystery was built in 1886 by A. C. Brown at Tottenville, New York, as a commercial fishing trawler.

The 3rd Naval District inspected her on May 7, 1918 for possible World War I U.S. Navy service.

The Navy chartered her from Empire Water Co., Inc., of New York City on 18 July 1918, took her over 20 August 1918, assigned her Identification Number (ID.

[2] Assigned to the 3rd Naval District, Mystery served as a support ship for minesweepers operating in the approaches to New York Harbor.