 Argentina: Mk 4 variant and L34A1 suppressed variant.

 Frente Nacional de Libertação de Angola
 Australia: L34A1 suppressed variant.

 Bahrain: Mk 3 (trials) and Mk 4 variants.

 Bangladesh: Mk 4 variant.

 Barbados
 Belize: Mk 4 variant.

 Botswana
 Brazil: Mk 3 variant, trials only
 Brunei: Mk 4 variant.

 Canada: Produced as the C1.

 Cuba: Mk 3 variant, trials only
 Cyprus
 Dominican Republic
 Egypt: Mk 3 variant
 Eswatini
 France: Mk 3 variant, trials only
 Gabon
 Gambia
 Ghana
 Guyana
 India: 32,536 Mk 4 were delivered.
licensed version were built by the Indian Ordnance Factories and stopped in 2010.Currently all the remaining SMG are being replaced by Caracal International CAR 816.

 Iran: replaced by MP5 Submachine Gun
 Iraq: Mk 4 variant.
Around 13,241 Mk 4s made and sold to Iraq.

 Kurdistan – Peshmerga
 Jamaica: Used by the Jamaica Defence Force as a personal defense weapon for auxiliary units.

 Kenya
 Kuwait: L2A3 variant
 Lebanon
 Lesotho
 Libya: Mk 2 and L34 variants and Indian-made 1A1
 Malawi
 Malaysia: at least 18,500 Mk 4 bought
 Malta
 Morocco
 Myanmar
   Nepal
 New Zealand
 Nigeria
 North Korea
 Oman
 Papua New Guinea
 Philippines: L34A1s used by Naval Special Warfare Group.

 Portugal
 Qatar
 Rhodesia
 Sierra Leone
 Singapore: Mk 3 variant ordered for trials.
Mk 4 variant used by Singapore Police Force's paramilitary units—Gurkha Contingent, Police Coast Guard and Police Special Operations Command; replaced by the Heckler & Koch MP5 since 1999.

 Solomon Islands
 Somalia
 South Africa: Mk 3 variant, trials only
 Spain: UOE special group of the Spanish Navy.

 Sri Lanka
 Sudan
 Sweden: Mk 3 variant, trials only
 Tanzania
 Tunisia
 Trinidad and Tobago
 Uganda
 United Kingdom: L2A1 variant was accepted by the British Army in 1953.
L34A1 variant entered service in 1966.
Mk 3 variant used by the Royal Ulster Constabulary from 1971 to 1992 when replaced by the Heckler & Koch MP5.

 West Germany: Mk 3 and Mk 4 variants, trials only
 Vanuatu
 Zambia
 Zimbabwe
 Argentina: Mk 4 variant and L34A1 suppressed variant.
 Frente Nacional de Libertação de Angola
 Australia: L34A1 suppressed variant.
 Bahrain: Mk 3 (trials) and Mk 4 variants.
 Bangladesh: Mk 4 variant.
 Barbados
 Belize: Mk 4 variant.
 Botswana
 Brazil: Mk 3 variant, trials only
 Brunei: Mk 4 variant.
 Canada: Produced as the C1.
 Cuba: Mk 3 variant, trials only
 Cyprus
 Dominican Republic
 Egypt: Mk 3 variant
 Eswatini
 France: Mk 3 variant, trials only
 Gabon
 Gambia
 Ghana
 Guyana
 India: 32,536 Mk 4 were delivered. licensed version were built by the Indian Ordnance Factories and stopped in 2010.Currently all the remaining SMG are being replaced by Caracal International CAR 816.
 Iran: replaced by MP5 Submachine Gun
 Iraq: Mk 4 variant. Around 13,241 Mk 4s made and sold to Iraq.
 Kurdistan – Peshmerga
 Jamaica: Used by the Jamaica Defence Force as a personal defense weapon for auxiliary units.
 Kenya
 Kuwait: L2A3 variant
 Lebanon
 Lesotho
 Libya: Mk 2 and L34 variants and Indian-made 1A1
 Malawi
 Malaysia: at least 18,500 Mk 4 bought
 Malta
 Morocco
 Myanmar
   Nepal
 New Zealand
 Nigeria
 North Korea
 Oman
 Papua New Guinea
 Philippines: L34A1s used by Naval Special Warfare Group.
 Portugal
 Qatar
 Rhodesia
 Sierra Leone
 Singapore: Mk 3 variant ordered for trials. Mk 4 variant used by Singapore Police Force's paramilitary units—Gurkha Contingent, Police Coast Guard and Police Special Operations Command; replaced by the Heckler & Koch MP5 since 1999.
 Solomon Islands
 Somalia
 South Africa: Mk 3 variant, trials only
 Spain: UOE special group of the Spanish Navy.
 Sri Lanka
 Sudan
 Sweden: Mk 3 variant, trials only
 Tanzania
 Tunisia
 Trinidad and Tobago
 Uganda
 United Kingdom: L2A1 variant was accepted by the British Army in 1953. L34A1 variant entered service in 1966. Mk 3 variant used by the Royal Ulster Constabulary from 1971 to 1992 when replaced by the Heckler & Koch MP5.
 West Germany: Mk 3 and Mk 4 variants, trials only
 Vanuatu
 Zambia
 Zimbabwe
Sterling submachine gun