| Acronym | Definition |
|---|
| ORBA | Off-Road Business Association |
| ORBA | Ontario Road Builders Association (Canada) |
| ORBA | Orchard Road Business Association (Singapore) |
| ORBA | Object Request Broker Architecture |
| ORBA | Ostrow Reisin Berk & Abrams, Ltd |
| ORBA | Oak Ridge Bridge Association (Oak Ridge, TN) |
| ORBA | Oak Ridge Business Association (Oak Ridge, TN) |
| ORBA | Oregon Restaurant and Beverage Association |
| ORBA | Ocoee Region Builders Association (Cleveland, TN) |
| ORBA | Osgoode-Rideau Basketball Association |
| ORBA | Optimized Reduced Basis Approximation |
| ORBA | Optimal Recovery Balance Analysis |
| ORBA | OLIBS Replicating Breeders Association |
| ORBA | Official Referees Bar Association |
| ORBA | Oxford Recreational Baseball Association (Oxford, MI) |