Fort Amherstburg, British military fort in Amherstburg, Canada

Fort Amherstburg is a British military fort in Amherstburg, Canada, situated at the point where the Detroit River meets Lake Erie. The site consists of bastions, barracks, and other defensive structures built to British military standards of the late 18th century.

The Royal Canadian Volunteers began building Fort Amherstburg in 1786, and it was expanded before the War of 1812 to include the King's Navy Yard. In January 1797 it was officially named Fort Amherstburg after General Lord Amherst, though locals called it Fort Malden. It was Britain's main defence on the Detroit frontier during the War of 1812.

The fort takes its name from Jeffery Amherst, a British military commander from the 18th century. Inside the surviving buildings, visitors can see period uniforms, tools, and everyday objects that show how soldiers lived and worked on this site.

The grounds are best explored on foot, and walking along the bastions gives a clear view over the Detroit River. Spending time inside the buildings alongside the outdoor areas gives a fuller picture of the site.

Part of the northwest bastion dates from the American reconstruction phase after 1813, meaning that British and American building phases can be seen side by side today. This makes the site one of the few places where the physical layers of the border history between the two countries are still visible.