| Acronym | Definition |
|---|
| OCWA | Ontario Clean Water Agency |
| OCWA | Orange-crowned Warbler |
| OCWA | Onondaga County Water Authority |
| OCWA | Oxford Companion to Western Art |
| OCWA | Orange County Water Authority (New York) |
| OCWA | Octopus Mountain, Washington |
| OCWA | Overseas Chinese Website Association |
| OCWA | Ohio Championship Wrestling Association |
| OCWA | Operations Center Work Area |
| OCWA | Oregon Construction Workforce Alliance |
| OCWA | Oroua Catchment Water Allocation |
| OCWA | Orthodox Christian Women's Association |
| OCWA | Oldmans Creek Watershed Association |
| OCWA | Orange County Woodworkers Association (Orange County, California) |
| OCWA | Oklahoma CattleWomen's Association, Inc. |
| OCWA | Outdoor Championship Wrestling Alliance |
| OCWA | Oxford Community Work Agency |
| OCWA | Ontario County Wiffle Association (Farmington, NY) |