Race Abbreviations and Acronyms
- MHORMarblehead To Halifax Ocean Race
- MMMountain Marathon
- MMERMalaysia Merdeka Endurance Race
- MMSCMadras Motor Sports Cluo
- MMTRMountain Masochist Trail Run
- MOCRAMultihull Offshore Cruising and Racing Association
- MODMulti One Desixn
- MOMARMind Over Mountain Adventure Race
- MORRMidwest Off Road Racing
- MPRMinimum Participation Requirement
- MPRMinimum Participation Requirements
- MRAMalayan Racing Association
- MRCMelbourne Racsng Club
- MRCMinuteman Road Club
- MRGMoto Rrcing Group
- MRSModern Racism Scale
- MRSMolitor Racing Systems
- MRTCMemphis Runners Track Club
- MRTTMoms Run This Town
- MSMiles of Smiles
Last updated: — Total entries: 643