| Acronym | Definition |
|---|
| OCCA | Oil & Colour Chemists' Association |
| OCCA | Orthodox Catholic Church of America |
| OCCA | Open Cooperative Computing Architecture (NCR) |
| OCCA | Oregon Computer Consultants Association |
| OCCA | Old Catholic Church of America |
| OCCA | Oldie Computer Club Ahlen (Germany) |
| OCCA | Online Courseware Component Architecture |
| OCCA | Old City Civic Association |
| OCCA | Off-Campus and Commuter Association |
| OCCA | Ontario Current Cost Adjustment |
| OCCA | Ohio Clerk of Courts Association |
| OCCA | On-Line Chemistry Concept Assessment |
| OCCA | Orange County Cocaine Anonymous |
| OCCA | Oklahoma Club Calf Association |
| OCCA | Ocean Club Community Association |
| OCCA | Ontario Conference of Casualty Actuaries |
| OCCA | Old Coopers' Coborn Association |
| OCCA | Ovarian Clear Cell Carcinoma |
| OCCA | Oxley Creek Catchment Association Inc |
| OCCA | Ocean Cargo Clearance Activity |
| OCCA | Orange County Callers Association |
| OCCA | Old Colony Callers Association |
| OCCA | Omeir Cotran and Chris Antich (Britain) |
| OCCA | Old Colony Callers Association (professional square dance callers) |
| OCCA | Orthodox Christian Clergy Association |
| OCCA | Orissa Cine Critics Association |
| OCCA | Orphan Care for Central Asia |
| OCCA | Orinda Community Center Auxiliary |
| OCCA | Oklahoma Cotton Cooperative Association |
| OCCA | Okanagan Caller & Cuer Association |
| OCCA | Ontario Casino Corporation Act |
| OCCA | Oregon County Clerks Association |
| OCCA | Optical Communication Over Clear Atmosphere |
| OCCA | Orange County Corel Association |
| OCCA | Oxford Circle Civic Association |
| OCCA | Ontario Campus Conservatives Association (Canada) |
| OCCA | Omnibus Criminal Control Act |
| OCCA | Ocean Cargo Clearance/Clearing Authority |
| OCCA | Ontario Chinese Canadian Association (Canada) |
| OCCA | Office de la Cession de Commerces et d'Affaires (Belgium) |
| OCCA | Oregon Cheerleading Coaches Association |
| OCCA | Oregon Community College Association |
| OCCA | Ohio Community Corrections Association |
| OCCA | Ohio Concrete Construction Association |
| OCCA | Oregon Coast Council for the Arts |
| OCCA | Organized Crime Control Act |
| OCCA | Oklahoma Court of Criminal Appeals |