| Abbreviation | Definition |
|---|---|
| RHSA | Richardson Home School Association |
| RHSA | Royal Humane Society of Australasia |
| RHSC | Rochester Hearing and Speech Center |
| RHSM | Red Hat Subscription Manager |
| RHSM | Rowland Hall-St Mark's |
| RHSO | Regional Housing Services Office |
| RHSO | Rivers Heritage Site and Orchard |
| RHSO | Rivers Heritage Site Orchard |
| RHSO | Rose Hip Seed Oil |
| RHT | Recirculating High Temperature |
| RHT | Red Hot Tamale |
| RHT | Red Hot Topic |
| RHT | Reinforced Heel And Toe |
| RHT | Reinforced Heel Toe |
| RHT | Reinforced Heels And Toes |
| RHT | Relative Humidity and Temperature |
| RHT | Remote Hands on Training |
| RHT | Restoration Hydro Turbine |
| RHT | Right Hand Thread |
| RHT | Right Heart Thrombi |