| USRA | Undergraduate Student Research Assistantship 
| Others |
| USRA | Undergraduate Student Research Award
| Others |
| USRA | United Shoe Retailers Association
| Others |
| USRA | United Slot Racers Association
| Others |
| USRA | United States Racing Association
| Others |
| USRA | United States Racquetball Association
| Others |
| USRA | United States Railroad Administration
| Others |
| USRA | United States Railway Association
| Others |
| USRA | United States Rally Association
| Others |
| USRA | United States Revolver Association
| Others |
| USRA | United States Rimfire Association
| Others |
| USRA | United Stockcar Racers Association
| Others |
| USRA | Universities Space Research Association
| Others |
| USRA | Unlimited Scale Racing Association
| Others |
| USRA | Utah Sportsman Racing Association
| Others |