| Abbreviation | Definition |
|---|---|
| MHJ | Men's High Jump |
| MHJ | Minnesota Hockey Journal |
| MHL | Montreal Hockey League |
| MIA | Miami Marlins |
| MIAA | Massachusetts Interscholastic Athletic Association |
| MIAA | Memphis Interscholastic Athletic Association |
| MIAA | Michigan Intercollegiate Athletic Association |
| MIB | Most Improved Bowler |
| MIBC | Melaka International Bowling Centre |
| MIC | Make It Count |
| MIFC | Malaysia International Fireworks Competition |
| MIG | Mobile Interactive Games |
| MIGB | Mercer Island Girls Basketball |
| MIGC | Monkey Island Golf Club |
| MIGS | Montpelier Inn Golf Society |
| MIL | Milwaukee Brewers |
| MIMC | Melaka International Motorsports Circuit |
| MIMM | Mammut International Mountain Marathon |
| MIN | Minnesota Twins |
| MIS | Mississauga Sports Centre |