USS Winnipec was a Mohongo-class gunboat built for the Union Navy during the final days of the American Civil War.

Winnipec—a double-ended, iron-hulled, sidewheel gunboat—was built in 1864 at Boston, Massachusetts, by Harrison Loring.

The ship was launched on 20 August 1864, but there is no record of her having been commissioned during the American Civil War or any portion of the year 1865.

Deck logs exist for Winnipec during the period 1 January to 6 October 1866, at which time she was assigned to the United States Naval Academy at Annapolis, Maryland, as a practice ship.

In 1868, Winnipec was placed in ordinary at Norfolk and remained in that status until she was sold to Mr. Thomas Clyde on 17 June 1869.