| 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) |