| Rank | Abbreviation | Meaning |
|---|
| ***** | OCWA | Ontario Clean Water Association
| |
| ***** | OCWA | Oroua Catchment Water Allocation
| |
| **** | OCWA | Orange-crowned Warbler
| |
| **** | OCWA | Operations Center Work Area
| |
| *** | OCWA | Orthodox Christian Women's Association
| |
| *** | OCWA | Outdoor Championship Wrestling Alliance
| |
| *** | OCWA | Ohio Championship Wrestling Association
| |
| ** | OCWA | Of an Orange County Water
| |
| ** | OCWA | Ontario Clean Water Act
| |
| ** | OCWA | Ontario County Wiffle Association
| |
| ** | OCWA | Outcasted Championship Wrestling Alliance
| |
| * | OCWA | Ordination of Catholic Women Are
| |
| * | OCWA | Octopus Mountain, Washington
| |
| * | OCWA | Oregon Construction Workforce Alliance
| |
| * | OCWA | Overseas Chinese Website Association
| |
| * | OCWA | Orange County Woodworkers Association
| |
| * | OCWA | Oldmans Creek Watershed Association
| |
| * | OCWA | Onondaga County Water Authority
| |
| * | OCWA | Orange County Water Authority
| |
| * | OCWA | Ontario Clear Water Agency
| |
| * | OCWA | Oley Creek Watershed Association
| |
| * | OCWA | Oklahoma CattleWomen's Association, Inc.
| |
| * | OCWA | Oxford Companion to Western Art
| |
| * | OCWA | Organizational Consolidation Workload Alignment
| |
| * | OCWA | Oxford Community Work Agency
| |