| 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) |