| Maag, Simon | Liechtenstein U17 |  Liechtenstein | Defender |
| Maah, Robert | CFR Cluj (ROU) |  France | Forward |
| Maak, Matthias | Wiener Neustadt (AUT) / Austria U21 |  Austria | Defender |
| Maalinn, Karoliine | Estonia WU19 |  Estonia | Forward |
| Maanum, Hanna | Stabæk (NOR) |  Norway | Midfield |
| Mabiala, Larrys | Karabükspor (TUR) |  Democratic Republic of the Congo | Defender |
| Macanović, Adil | Litija (SVN) |  Slovenia | Defender |
| Macarrão | Helvécia (ENG) |  Portugal | Forward |
| Macedo, Keiron | Gibraltar FUT |  Gibraltar | Goalkeeper |
| Macedo Da Silva, Fernando | Osasuna (ESP) |  Spain | Midfield |
| Macek, Roman | Czech Republic U17 |  Czech Republic | Midfield |
| Maceri, Valentina | Verona (ITA) |  Italy | Midfield |
| Machairas, Dimitrios | Greece U21 |  Greece | Midfield |
| Machaj, Mateusz | Lechia (POL) |  Poland | Midfield |
| Machart, Julie | Juvisy (FRA) | France | Forward |
| Macheda, Federico | Stuttgart (GER) | Italy | Forward |
| Macho, Jürgen | Admira (AUT) | Austria | Goalkeeper |
| Machura, Pawel | Poland FUT | Poland | Defender |
| Maciaszczyk, Diana | Poland WU17 | Poland | Midfield |
| Mačiulis, Nerijus | Kruoja (LTU) / Lithuania FUT |  Lithuania | Midfield |
| Mackain, Scott | Santos (SCO) |  Scotland | Defender |
| MacKay, David | St Johnstone (SCO) | Scotland | Defender |
| Mackie, Jamie | QPR (ENG) / Scotland | Scotland | Forward |
| Mackin, Aimee | Northern Ireland WU17 |  Northern Ireland | Forward |
| Macklin, Gail | Glentoran (NIR) | Northern Ireland | Midfield |
| Macogonenco, Denis | Moldova U17 |  Moldova | Goalkeeper |
| Macrițchii, Valerii | Moldova U17 | Moldova | Midfield |
| Macrițchii, Andrei | Moldova U17 | Moldova | Forward |
| Mączkowski, Jakub | Poland FUT | Poland | Forward |
| Mączyński, Krzysztof | Górnik (POL) | Poland | Midfield |
| Madatov, Mahir | Azerbaijan U17 |  Azerbaijan | Forward |
| Madej, Lukasz | Bełchatów (POL) | Poland | Midfield |
| Mader, Florian | Austria Wien (AUT) | Austria | Midfield |
| Madera, Sebastian | Lechia (POL) | Poland | Defender |
| Madl, Michael | Sturm (AUT) | Austria | Defender |
| Madlung, Alexander | Wolfsburg (GER) |  Germany | Defender |
| Madsen, Emma | Brøndby (DEN) |  Denmark | Forward |
| Madsen, Pernille | Brøndby (DEN) / Denmark WU19 | Denmark | Midfield |
| Madsen, Johannes | Midtjylland (DEN) | Denmark | Forward |
| Madsen, Marie Maj | Denmark WU17 | Denmark | Forward |
| Madsen, Emil Rom | Faroe Islands U17 |  Faroe Islands | Goalkeeper |
| Maduro, Hedwiges | Sevilla (ESP) |  Netherlands | Defender |
| Maendly, Sandy | Torres (ITA) / Switzerland WOCO |  Switzerland | Midfield |
| Mäenpää, Niki | VVV (NED) / Finland |  Finland | Goalkeeper |
| Mäeots, Siim | Estonia U19 | Estonia | Defender |
| Maes, Kristof | Gent (BEL) |  Belgium | Goalkeeper |
| Maestro, Nelly | Spain WU19 | Spain | Midfield |
| Maevski, Konstantin | MFK Dinamo (RUS) / Russia FUT |  Russia | Defender |
| Maffezzoni, Elena | Verona (ITA) | Italy | Defender |
| Maftei, Vasile | CFR Cluj (ROU) |  Romania | Defender |
