| Acronym | Definition |
|---|
| MRRN➣Michigan Recruitment & Retention Network |
| MRRN➣Middle Rhombencephalic Reticular Nucleus (neurology) |
| MRRN➣Management Resource Reference Number |
| MRRN➣Mlodziezowy Ruch Rycerstwa Niepokalanej (Polish: Militia Immaculata Youth Movement) |