Users
- Argentina
- Afghanistan
- Australia: M203PI variant for F88 Austeyr, and M203A1 for M4A1 carbines.
- Austria: M203PI variant.
- Brazil
- Brunei
- Cameroon
- Canada: Canadian Forces.
- Czech Republic: Bushmaster M203 used with the Bushmaster M4A3 carbine issued to Czech special forces.
- Denmark
- East Timor
- Ecuador
- Egypt
- El Salvador
- France
- Gabon
- Georgia
- Greece
- Guatemala
- Honduras
- India
- Indonesia: Locally produced by PT Pindad as SPG-1.
- Ireland
- Israel
- Italy
- Jordan
- Kuwait
- Lebanon
- Liberia
- Malaysia: Used on M4A1.
- Myanmar
- Mexico
- New Zealand: M203PI variant.
- Oman
- Pakistan: Used by the Special Services Group.
- Panama
- Philippines Also created by the Floro International Corporation as the FIC M203 in 2008.
- Qatar
- Saudi Arabia
- Singapore
- South Korea: A locally-manufactured clone, designated K201, is deployed on the K2 assault rifle.
- Sri Lanka
- Sweden
- Thailand
- Turkey
- United Arab Emirates
- United Kingdom: Special Air Service
- United States
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