 Peter Matthews | Athletiek |
 Matti Mattsson | Aquatics |
 Sofia Mattsson | Worstelen |
| Johanna Mattsson | Worstelen |
 Volodymyr Matviychuk | Boksen |
 Alessia Maurelli | Gymnastiek |
 Radoslava Mavrodieva | Athletiek |
 Victoria Max-Theurer | Ruiter |
 Kevin Mayer | Athletiek |
 Mikaela Mayer | Boksen |
 Lisa Mayer | Athletiek |
| Andrea Mayr | Athletiek |
 Ida Mayrin | Gymnastiek |
 Sarah Myriam Mazouz | Judo |
 Volha Mazuronak | Athletiek |
 Nikola Mazurová | Schieten |
| Riccardo Mazzetti | Schieten |
| Anna Maria Mazzetti | Triatlon |
 Hortence Vanessa Mballa Atangana | Judo |
| Christian Mbilli Assomo | Boksen |
 Francky-Edgard Mbotto | Athletiek |
| Judith Mbougnade | Boksen |
| Joelle Mbumi Nkouindjin | Athletiek |
 Brandon McBride | Athletiek |
| Martha McCabe | Aquatics |