| Abbreviation | Definition |
|---|---|
| NTRC | Naples Therapeutic Riding Center |
| NTRC | Northland Therapeutic Riding Center |
| NYR | North Yorkshire Riding |
| OPRC | Old Peoples Riding Club |
| ORC | Oyl Riding Club |
| OVERRIDE | Overriding |
| PBR | Pro Bull Riding |
| PBR | Profesional Bull Riding |
| PBR | Professional Bull Riding |
| PDRC | Peebles and District Riding Club |
| PRDA | Pacific Riding For Developing Abilities |
| PRDC | Petaluma Riding Driving Club |
| PRIUS | Prick Riding In Ugly Scooter |
| PRTR | Promise Ranch Therapeutic Riding |
| PSVW | Paarden Sport Vereniging Westland |
| PWRA | Peter Williams Riding Apparel |
| RBR | Riding By Reasoning |
| RERS | Red Earth Riding School |
| RFOL | Riding for Our Lives |
| RHDA | Redheroes Driver Academy |