SMG may refer to the following:
- M7/Caseless Submachine Gun - The SMG in Halo 2, Halo 2: Anniversary, Halo 3, Halo Wars, Halo: Spartan Assault and Halo: Spartan Strike.
- M7S Caseless Submachine Gun - The Suppressed SMG in Halo 2 Vista's Example map, Halo 2: Anniversary's multiplayer and Halo 3: ODST.
- M20/Personal Defense Weapon - The SMG in Halo 5: Guardians.
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