| Abbreviation | Definition |
|---|---|
| MERACE | ME Race |
| MERACE | Me Race |
| MERACE | Me ' Race |
| MERACE | ME – Race |
| MERACE | Me 'Race |
| MERCEDES | My Engine Raced Car Exploded Damn Engine Seized |
| MFR | Mad Force Racing |
| MGO | Mechanical Gear Oil |
| MGRW | Mardi Gras Race Week |
| MHOR | Marblehead to Halifax Ocean Race |
| MHRS | Mount Hotham Racing Squad |
| MHRS | Mt Hotham Racing Squad |
| MHRT | Mt Hood Race Team |
| MIATA | Miata Is Always The Answer |
| MIMR | Marseille International Match Race |
| MIR | Maryland International Raceway |
| MIR | Maryland Int'l Raceway |
| MLCR | Myths and Legends of the Celtic Race |
| MLRE | Mike Lough Racing Engines |
| MM | Mille Miglia auto race |