| Abbreviation | Definition |
|---|---|
| MTFC | Merthyr Tydfil Football Club |
| MTFC | Michigan Tigers Futbol Club |
| MTFC | Mildenhall Town Football Club |
| MTFC | Morpeth Town Football Club |
| MTPC | Middle Tennessee Pony Club |
| MTRC | Manchester Tennis and Racquets Club |
| MTRC | Middle Tennessee Reef Club |
| MTSC | Manheim Township Soccer Club |
| MTSC | Metro Tulsa Soccer Club |
| MTSC | Monroe Township Soccer Club |
| MTSC | Montgomery Travelers Soccer Club |
| MTVC | Marten Toonder Verzamelaars Club |
| MUAAC | Massey University Aerial Arts Club |
| MUAC | Melbourne University Athletics Club |
| MUAC | Morgantown United Aquatic Club |
| MUBC | Melbourne University Baseball Club |
| MUBC | Melbourne University Basketball Club |
| MUBC | Melbourne University Boat Club |
| MUBC | Miami University Blockchain Club |
| MUGC | Melbourne University Gridiron Club |