| Abbreviation | Definition |
|---|---|
| MRN | Missionary Resources Network |
| MRPL | Master of Religion and Public Life |
| MRS | Mixed Race Sinner |
| MRS | Muslim Religious Service |
| MRSS | Midwest Religion and Science Society |
| MS | Mighty Soul |
| MS | Mighty Spirit |
| MSA | Merciful, Selfless, and Adorable |
| MSACC | Muslim State Armed Conflict and Compliance |
| MSACC | Muslim State Armed Conflict Compliance |
| MSBC | Madison Street Baptist Church |
| MSBC | Main Street Baptist Church |
| MSBC | Military Street Baptist Church |
| MSBC | Morning Star Baptist Church |
| MSBC | Mountain Side Baptist Church |
| MSC | Men Seeking Christ |
| MSC | Mission Service Corps |
| MSC | Missionarii Sacratissimi Cordis |
| MSC | Missionarii Sacratissimi Cordis (Missionaries of the Sacred Heart) |
| MSCB | Missionary Sisters of Charles Borremo |