Users
- Australia Used by Australian forces during WWII until it was replaced by the Australian-made Owen submachine gun.
- Belgium
- Brazil Used by the Brazilian forces during WWII and after the war, until the middle of the Decade of 80.
- Canada
- Dominican Republic
- People's Republic of China: Limited, sometimes unlicensed copies.
- Republic of China
- Croatia
- France
- Greece Used by Greek armed forces, resistance fighters, Gendarmerie and police units during World War II and immediately postwar.
- Haiti
- India Used by Chindits in Burma campaign
- Indonesia Used by Indonesian Army Special Forces in 1950-1970s
- Ireland: 123 used by the Irish Defence Forces during the Emergency.
- Israel:
- Italy: Captured examples pressed into use by the Italian Army prior to September 8, 1943. Also supplied to partisans and to the Italian Co-Belligerent Army. After the war, it was mostly issued to Italian Air Force troopers and the Carabinieri.
- Japan: Used in some quantities by the Japanese Maritime Self-Defense Forces.
- Republic of Korea:Captured by People's Liberation Army and limited received U.S government used at Korean War, Vietnam War
- Luxembourg: M1A1 in service 1952-1967, replaced by Uzi.
- Nazi Germany: Captured from United States Army, limited use in Second World War
- The Netherlands: In early World War II, at least 3,680 Thompsons acquired through Lend-Lease.
- New Zealand
- North Vietnam: Unlicensed copies. Used by North Vietnamese soldiers in the First Indochina War
- Philippines
- Portugal: Small number bought for police use, designated m/1928
- South Vietnam
- Soviet Union
- Sweden
- Turkey:limited received U.S government used at Korean War
- United Kingdom
- United States: Employed by the United States Marine Corps and by United States Army 1938.
- West Germany: Limited number received from U.S. and Used by Nazi Germany
- Yugoslavia
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