| Abbreviation | Definition |
|---|---|
| MKC | Mississauga Kendo Club |
| MKC | Mosport Kart Club |
| MKCI | Michigan Kart Club, Inc. |
| MKF | Midlands Kite Fliers of Great Britain |
| MKF | Midwest Kendo Federation |
| MKK | Melbourne Kyokushin Karate |
| MKK | Michiana Kart Klub |
| MKS | Mighty Kicking Six |
| MKSC | Milwaukee Kickers Soccer Club |
| ML | Major League |
| MLA | Major League Arc |
| MLAM | Major League Alumni Marketing |
| MLB | Major League Baseball |
| MLB | Maple Leaf Baseball |
| MLBPA | Major League Baseball Players Association |
| MLDA | Mock LISA Data Archive |
| MLE | Minor League Equivalence |
| MLF | Major League Football |
| MLFB | Major League Fantasy Baseball |
| MLFC | Mulhuddart Ladies Football Club |