| Abbreviation | Definition |
|---|---|
| MWF | Massacre Wrestling Federation |
| MWF | Michigan Wrestling Federation |
| MWF | Midget Wrestling Federation |
| MWF | Millennium Wrestling Federation |
| MWFA | Midwest Footbag Association |
| MWFA | Mid-Western Fighting Alliance |
| MWGC | Manhattan Woods Golf Club |
| MWL | Managers of the Midwest League |
| MWPA | Manitoba Water Polo Association |
| MWPA | Michigan Water Polo Association |
| MWRA | Maryland Washington Racquetball Association |
| MWS | Madden World Syndicate |
| MWV | Mike Walden Velodrome |
| MWW | Mid- Winters West Yacht Club |
| MWW | Minden Wild Water Preserve |
| MX | Motocross |
| MXT | Marvel X Treme |
| MYB | Mak Your Bet |
| MYB | Montgomery YMCA Barracuda Swim Team |
| MYC | Model Yacht Club |