OCG may refer to:
- Operation Clean Government, a citizens' lobby and advocacy organization in the United States
- Orchestre de chambre de Genève, a Swiss orchestra
- City of Granada Orchestra (Orquesta Ciudad de Granada), a Spanish orchestra
- Organized crime group
- Orthodox Church of the Gauls
- Occipital gyri (OcG), a structure in the brain
This disambiguation page lists articles associated with the title OCG.
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