| Abbreviation | Definition |
|---|---|
| MISL | Major Indoor Soccer League |
| MIT | Mighty Intermission Time |
| MITB | Money In The Bank |
| MITM | Monkey In The Middle |
| MITS | Made In The Shade |
| MIV | Cisco MIlton Pan Am / Parapan Am Velodrome |
| MIW | Minnesota Independent Wrestling |
| MJ | Michael Jordan |
| MJC | Manila Jockey Club |
| MJCI | Manila Jockey Club, Inc. |
| MJM | Mid-July Meet |
| MJWL | Metro Junior Wrestling League |
| MK | Match King |
| MK | Medium Kick |
| MK | Mortal Kombat |
| MKA | Maui Kiteboarding Association |
| MKA | Modern Kempo Association |
| MKAC | Milton Keynes Athletic Club |
| MKAI | Midwest Karate Association |
| MKC | Michigan Kart Club, Inc. |