Users
- Argentina
- Bolivia
- People's Republic of China: Copies made as the Type 36 and used in the Korean War by Chinese soldiers.
- Dominican Republic
- Ecuador
- Greece Used by the Greek armed forces during World War II and the post-War World II period.
- Guatemala
- Japan: Used by the JSDF for a short period of time before the adoption of the Minebea PM-9. Known to be used by JGSDF tank crews as a personal defense weapon.
- Republic of Korea: Mainly used by Republic of Korea Army Special Warfare Command.
- Macedonia: 707 surplus M3 submachine guns were transferred to Macedonia in 1999.
- Morocco: 1,472 surplus M3A1 submachine guns were transferred to Morocco in the 90s.
- Philippines: Had their M3 submachine guns released from reserve stockpiles by the Philippine Navy for the Philippine Marine Corps's special forces due to budget constraints. Modifications done on the refurbished weapons include an integral suppressor and a Picatinny rail. The weapon had been tested with a prototype on May 2004.
- Soviet Union Received military aid from the US via Lend-Lease.
- United States
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