Fort Frederick, Military fort in Kingston, Canada

Fort Frederick is a military work on Point Frederick, on the grounds of the Royal Military College of Canada in Kingston, Ontario. It consists of earthworks surrounding a stone Martello tower built in 1846, which now houses the RMC Museum. The fort lies at the south end of the point, on the site of the former Kingston Royal Naval Dockyard.

The first fort here was earthworks built during the War of 1812; on 10 November 1812 its battery helped repel an American squadron under Commodore Isaac Chauncey. In 1846, during the Oregon boundary dispute, a stone Martello tower was raised on the same site as one of four towers strengthening Kingston's defences. The fort was abandoned in 1870.

The Martello tower at Fort Frederick houses the Royal Military College of Canada Museum, which is affiliated with the CMA, CHIN and the Virtual Museum of Canada. The fort grounds also serve as a recreation area for RMC officer cadets, where all cadets are treated as equals regardless of rank. The college's class of 1931 gave the fort wooden gates and a plaque in 1971 recalling its days as a recruit refuge.

Access to the fort is arranged through the Royal Military College of Canada and guided tours are available through the museum. Visitors should check in advance when tours are offered and how to arrange their visit.

Alexander Mackenzie, who later became Canada's second prime minister, worked as a construction foreman during the Martello tower's building. His early involvement in this project connected him to Canada's military heritage before his political career.