The Bermuda Garrison was the military establishment maintained on the British Overseas Territory and Imperial fortress of Bermuda by the regular British Army and its local militia and voluntary reserves from 1701 to 1957. The garrison evolved from an independent company, to a company of Royal Garrison Battalion during the American War of Independence, and a steadily growing and diversifying force of artillery and infantry with various supporting corps from the French Revolution onwards. During the American War of Independence, the garrison in Bermuda fell under the military Commander-in-Chief of America. Subsequently, it was part of the Nova Scotia Command until 1868, and was an independent Bermuda Command from then until its closure in 1957.

Lord Salisbury described Malta, Gibraltar, Bermuda, and Halifax as Imperial fortresses at the 1887 Colonial Conference, though by that point they had been so designated for decades. Later historians have also given the title "imperial fortress" to St. Helena and Mauritius.