RMSJ
| Acronym | Definition |
|---|---|
| RMSJ | Records Management Society of Japan (est. 1989) |
| RMSJ | Rocky Mountain Show Jumping (Calgary, Alberta, Canada) |
| RMSJ | Ryan Marciano Sunnery James (disc jockey duo; Amsterdam, Netherlands) |
| RMSJ | Response to Motion for Summary Judgment (legal document) |