RMSI
| Acronym | Definition |
|---|---|
| RMSI | Regional Maritime Security Initiative (US Pacific Command) |
| RMSI | Removable Media Solutions, Inc. |
| RMSI | Richmond Main Street Initiative (California) |
| RMSI | Regular Member Selection Interview (preparatory guide; Royal Canadian Mounted Police; Canada) |
| RMSI | Risk Management Services, Inc. (various locations) |
| RMSI | Rocky Mountain Systems, Inc. (telecommunications) |