Machine Gun Kelly, or MGK, is an American musician, rapper and actor.
MGK may also refer to:
- Machine Gun Kelly, an American gangster
- MGK Bur (Compact Grenade-launching System, Malogabaritnyi Granatomyotnyi Kompleks), a Russian grenade launcher
- National Security Council (Turkey) or Milli Güvenlik Kurulu (MGK), Turkey's national security council
- Mongolian Great Khural or MGK, Mongolia's national legislature
- Jim Kelly, American football Hall of Fame quarterback