The Hyde-Inland M2 was a United States submachine gun design submitted for trials at Aberdeen Proving Ground in February 1941.

An improved Hyde-Inland 2 was designated U.S. Submachine gun, Caliber .45, M2 as a substitute standard for the M1 Thompson in April 1942.

None of the approximately 400 manufactured were issued by any branches of the United States military.

The receiver was built from a steel forging and a seamless tubular section, which took extra time and effort to machine and finish, causing the US Army to adopt the M3 with a simple stamped sheet metal receiver instead.

Like the American Thompson and Finnish Suomi designs, the M2 bolt was shaped with large diameter rear and slender front sections.