Fort Ethan Allen was a United States Army installation in Vermont, named for American Revolutionary War figure Ethan Allen. Established as a cavalry post in 1894 and closed in 1944, today it is the center of a designated national historic district straddling the town line between Colchester and Essex. Locally, it is known simply as "The Fort", and now houses a Vermont National Guard installation a variety of businesses, academic institutions, and residential areas.

Ethan Allen was an American farmer, businessman, land speculator, philosopher, writer, lay theologian, American Revolutionary War patriot, and politician. He is best known as one of the founders of Vermont and for the capture of Fort Ticonderoga early in the Revolutionary War. He was the brother of Ira Allen and the father of Frances Allen.