| Abbreviation | Definition |
|---|---|
| RASI | Registered Agent Solutions Inc |
| RAT | Reaktivnaia Aviacionnaia Torpeda |
| RAT | Rotterdam Achter Tralies |
| RAT | The Rathdrum |
| RAT | The Rathskeller Restaurant |
| RAU | Oscar Rau Furniture Showroom |
| RAV | Radio At Vaughan |
| RAWO | Radio World Corp. |
| RB | Ruston Bucyrus |
| RBA | Reproduction Biology Associates, Atlanta, Georgia |
| RBA | Richard Brown Associates |
| RBAC | Recycling Business Assistance Center |
| RBAC | Regional Business Assistance Corporation |
| RBAC | Reuse Business Assistance Center |
| RBB | Regional Business Brokers, L.L.C. |
| RBB | Rivera Brothers Boxing |
| RBBB | Ringling Bros. and Barnum & Bailey Circus |
| RBBI | Recreational Boat Building Industry |
| RBBR | Rubber, Inc. |
| RBC | Rajeeb Broadcast Cluster |