HNoMS Sleipner was a 1. class gunboat built for the Royal Norwegian Navy.

Like all other Norwegian gunships of her era, she carried a heavy armament on a diminutive hull.

Sleipner's main weapon was a 26 cm (10-inch) cannon, of the same make and model other navies mounted[1] on battleships.

After her rebuild she was used as a cadet ship (training vessel) until 1915, when she started a new life as a floating barracks.

Between 1921 and 1932 Sleipner was used as a floating depot for the fledgling Royal Norwegian Navy Air Service, before she was finally decommissioned and scrapped in 1935.