ORTA
| Acronym | Definition |
|---|---|
| ORTA | Oak Ridges Trail Association (Canada) |
| ORTA | Ohio Retired Teachers Association (Columbus, OH) |
| ORTA | Olympic Roads and Transport Authority (Australia) |
| ORTA | Office of Research and Technology Application |
| ORTA | Ohio Rehabilitation Technology Association |
| ORTA | Ohio Rail Tourism Association (est. 1999) |