RMSO
| Acronym | Definition |
|---|---|
| RMSO | Rocky Mountain Sasquatch Organization (est. 2007) |
| RMSO | Rocky Mountain Symphony Orchestra (Canada) |
| RMSO | Regional Master Standing Offer |
| RMSO | Rocky Mountain Society of Orthodontists (Denver, CO) |
| RMSO | Regional Meeting of Section Officers (American Water Works Association) |
| RMSO | Regimental Supply Office |
| RMSO | Revue Mensuelle Suisse d'Odontostomatologie (French: Swiss Monthly Review of Dental Medicine; journal; Switzerland) |
| RMSO | Regional Manufacturing Support Organization (India) |