OWCA
| Acronym | Definition |
|---|---|
| OWCA | Old Wesley Collegians Association (est. 1926; Australia) |
| OWCA | Office of Workers' Compensation Administration (Louisiana Department of Labor) |
| OWCA | Ontario Wood Carvers Association (Toronto, Ontario, Canada) |
| OWCA | Obed Watershed Community Association (Crossville, TN) |
| OWCA | Origination without a Cool Acronym |
| OWCA | Organization without a Cool Acronym (Phineas and Ferb cartoon) |
| OWCA | Old Westminster Citizen Association (Westminster City School, London, UK) |