| Acronym | Definition |
|---|
| OECC➣Old English Car Club (Canada) |
| OECC➣Overseas Environmental Cooperation Center |
| OECC➣Oesterreichischer Citroën Club (German; automobile club; Austria) |
| OECC➣Optoelectronic and Communications Conference |
| OECC➣Ohio & Erie Canalway Coalition (est. 1989) |
| OECC➣Ozarks Electric Cooperative Corporation (Fayetteville, AR) |
| OECC➣Open End Correction Coefficient (acoustics) |