| Stefano Maccoppi | ITA | 2002/03 | 2 | 1 | 1 | 0 | 6 | 1 | Sampdoria U19 | | |
| Armando Madonna | ITA | 2003/04 | 12 | 6 | 4 | 2 | 27 | 14 | Albino Leffe U19, Inter U19 | | |
| Paolo Magnani | ITA | 2010/11 | 3 | 2 | 0 | 1 | 5 | 3 | Bologna U19 | | |
| Joël Magnin | SVI | 2018/19 | 2 | 1 | 0 | 1 | 4 | 5 | Young Boys U19 | | |
| Aldo Maldera | ITA | 1997/98 | 1 | 1 | 0 | 0 | 3 | 1 | Roma U19 | | |
| Lorenzo Mancano | ITA | 1993/94 | 3 | 2 | 0 | 1 | 6 | 5 | Foggia U19 | | |
| Mauro Mancini | ITA | 2011/12 | 1 | 1 | 0 | 0 | 1 | 0 | Città di Marino U19 | | |
| Paolo Mandelli | ITA | 2008/09 | 20 | 13 | 4 | 3 | 48 | 23 | Chievo Verona U19, Sassuolo U19, Spal U19 | | |
| Lorenzo Mangano | ITA | 1993/94 | 2 | 2 | 0 | 0 | 10 | 1 | Foggia U19, Genoa U19 | | |
| Devis Mangia | ITA | 2010/11 | 2 | 0 | 0 | 2 | 3 | 9 | Varese U19 | | |
| Andrea Manzo | ITA | 2007/08 | 5 | 3 | 0 | 2 | 8 | 5 | Parma U19 | | |
| Rolando Maran | ITA | 2001/02 | 1 | 1 | 0 | 0 | 3 | 0 | Cittadella U19 | | |
| Maregrande | SVI | 1995/96 | 1 | 1 | 0 | 0 | 6 | 0 | Monthey U19 | | |
| Alberto Mariani | ITA | 2011/12 | 2 | 2 | 0 | 0 | 13 | 1 | Grosseto U19 | | |
| Giancarlo Marini | ITA | 2025/26 | 1 | 0 | 0 | 1 | 1 | 3 | Frosinone U19 | | |
| Cristiano Márques Gómes | BRA - POR | 2016/17 | 2 | 1 | 0 | 1 | 3 | 1 | Olympique Lyonnais U19 | | |
| Nikola Marunic | SVI - SER | 2024/25 | 0 | 0 | 0 | 0 | 0 | 0 | Grasshoppers U19 | | |
| Pietro Maselli | ITA | 1992/93 | 1 | 0 | 1 | 0 | 0 | 0 | Genoa U19 | | |
| Marco Masi | ITA | 2015/16 | 2 | 1 | 0 | 1 | 3 | 5 | Sampdoria U19 | | |
| Franco Masia | ITA | 2004/05 | 2 | 1 | 1 | 0 | 4 | 2 | Cagliari U19 | | |
| Angelo Massola | ITA | 1993/94 | 1 | 0 | 0 | 1 | 0 | 1 | Como U19 | | |
| Luca Mattiussi | ITA | 2016/17 | 2 | 1 | 1 | 0 | 4 | 0 | Udinese U19 | | |
| Martino Melis | ITA | 2011/12 | 4 | 4 | 0 | 0 | 9 | 0 | Empoli U19 | | |
| Giorgio Melis | ITA | 2007/08 | 6 | 5 | 1 | 0 | 19 | 8 | Cagliari U19 | | |
| Leonardo Menichini | ITA - LIB | 2019/20 | 3 | 3 | 0 | 0 | 7 | 2 | Lazio U19 | | |
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