| OECA | Ontario Educational Communications Authority | |
| OECC | Old English Car Club | |
| OECC | Oesterreichischer Citroen Club | |
| OECC | Outdoor Events Coordinating Committee | |
| OECC | Opto Electronics And Communications Conference | |
| OECC | Overhead Environment Cavern-diver Course | |
| OECC | Oxford Environmental Consolidation Cell | |
| OECC | Overseas Environmental Cooperation Center | |
| OECC | Ouachita Electric Cooperative Corporation | |
| OECC | Optometric Eye Care Center | |
| OECC | Optometric Eye Care Centers | |
| OECC | Old English Car Club | |
| OECC | Optometric Eye Care Center | |
| OECC | Oberlin Early Childhood Center | |
| OECC | Ohio Eye Care Coalition | |
| OECC | Office Of Early Childhood Coordination | |
| OECC | Open End Correction Coefficient | |
| OECD | Optimize the Embodied Carbon of Designs | |
| OECD | Organization for Economic Co-operation and Development | |
| OECD | Organisation for Economic Co-operation and Development | |
| OECD | Organization for Economic Co-operation and Development | |
| OECD | Organizations For Economic Cooperation And Development | |
| OECD | A Organisation For Economic Country Development | |
| OECD | Organization of Economic Cooperation and Development | |
| OECD | Organisation for Economic Co-operation and Development |
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