| OCCA | Ocean Cargo Clearance Authority 
| Others |
| OCCA | Offsite Contemporary Construction for Accommodation
| Others |
| OCCA | Ohio College of Clowning Arts
| Others |
| OCCA | Ohio Community Corrections Association
| Others |
| OCCA | Oil and Colour Chemists' Association (UK based)
| Others |
| OCCA | Oil Colour Chemists Association
| Others |
| OCCA | Oklahoma Child Care Association
| Others |
| OCCA | Oklahoma Children's Cancer Association
| Others |
| OCCA | Oklahoma Court of Criminal Appeals
| Others |
| OCCA | Old Car Club of Albuquerque
| Others |
| OCCA | Old Catholic Church of America
| Others |
| OCCA | Omaha Chinese Culture Association
| Others |
| OCCA | Ontario Control Contractors Association
| Others |
| OCCA | Open Cooperative Computing Architecture
| Others |
| OCCA | Orange County Cocaine Anonymous
| Others |
| OCCA | Orange County Cricket Association
| Others |
| OCCA | Orange County Cruisin' Association
| Others |
| OCCA | Oregon Cheerleading Coaches Association
| Others |
| OCCA | Oregon Coast Council for the Arts
| Others |
| OCCA | Oregon Community College Association
| Others |
| OCCA | Oregon Computer Consultants Association
| Others |
| OCCA | Organized Crime Control Act
| Others |
| OCCA | Orthodox Catholic Church of America
| Others |
| OCCA | Otsego County Conservation Association
| Others |
| OCCA | Ottawa Child Care Association
| Others |
| OCCA | Oxford Centre for Christian Apologetics
| Others |