The Montana Military Museum is a military museum in Helena, Montana. It is dedicated to the rich heritage and history of the armed forces in the state.

The Montana Military Museum commemorates two centuries worth of military experiences in the state. It features exhibits that tell of the story of Fort Harrison and the military stories from all over Montana. It was established through the authorization grant received from the US Army Center of Military History in 1984.

The Montana Military Museum features displays that tell of the origins of the Special Forces, the history of the Lewis & Clark Expedition, and the story of the famous WWII dog sled teams among other things. It is open every Thursday or by appointment.