| Acronym | Definition |
|---|
| OCHA | Office for the Coordination of Humanitarian Affairs (United Nations) |
| OCHA | Oregon Council for Hispanic Advancement |
| OCHA | Orange County Housing Authority (California USA) |
| OCHA | Office of Consumer Health Assistance |
| OCHA | Off Campus Housing Assistance |
| OCHA | Orange County Homeowners Association |
| OCHA | Ohio Health Care Association |
| OCHA | Orleans County Historical Association (Albion, NY) |
| OCHA | Oxford Citizens Housing Association Ltd. (UK) |
| OCHA | Olmsted County Hockey Association (now Rochester Mite Hockey Association) |
| OCHA | Oregon Clearing House Association |