| Abbreviation | Definition |
|---|---|
| MSWA | Maryland State Wrestling Association |
| MSWA | Mid-South Wrestling Association |
| MSY | Metro Sports Youth |
| MT | Minnesota Twins |
| MTB | Mountain Bike |
| MTC | Melbourne Taekwondo Club |
| MTF | MensTennisForums.com |
| MTFA | Missouri Trout Fishermen's Association |
| MTFA-S | Missourt Trout Fishermen's Association - Springfield Chapter |
| MTFC | Middle Tennessee Futbol Club |
| MTFL | Middle Tennessee Football League |
| MTS | Motion Technology Selectorized (Life Fitness product) |
| MTSL | Michigan Team Swim League |
| MTW | Medieval Total War |
| MUF | Manly Ultimate Frisbee |
| MUFA | Madison Ultimate Frisbee Association |
| MUFC | Manchester United Football Club |
| MUFC | Manitowoc Ultimate Frisbee Concern |
| MUFF | Error, in Baseball |
| MUFF | Manchester United Football Fan |