Perun () was an monitor built for the Imperial Russian Navy in the mid-1860s. The design was based on the American , but was modified to suit Russian engines, guns and construction techniques. Spending her entire career with the Baltic Fleet, the ship was only active when the Gulf of Finland was not frozen, but very little is known about her service. "Perun" was struck from the Navy List in 1900 and became a pilot ship. Renamed "Lotsiia" (Pilot) in 1915, the ship was damaged during the Kronstadt rebellion of 1921 and laid up afterwards. She was run aground by a flood three years later and then her wreck was scrapped.