Teams total 570
| Name | From | To | Nationality |
|---|---|---|---|
| Mercatone Uno I | 1997 | 1997 |  |
| Mercatone Uno II | 2002 | 2002 | |
| Mercury - Viatel | 2001 | 2001 |  |
| Meridiana - Kamen | 2010 | 2020 |  |
| Metec - TKH | 2013 | 2020 |  |
| MG Maglificio - Technogym | 1995 | 1997 | |
| MG.Kvis - Colors for Peace | 2022 | 2024 | |
| Miche - Silver Cross | 2008 | 2010 | |
| Miche I | 2003 | 2007 | |
| Miche II | 2010 | 2011 | |
| Miko - Carlos - Février - Tönissteiner | 1986 | 1986 |  |
| Milaneza - Maia | 2004 | 2005 |  |
| Milaneza - MSS | 2001 | 2003 | |
| Mini Flat - Isoglass | 1989 | 1989 |  |
| Miranda - Mortágua | 2017 | 2020 | |
| Mitchelton - Scott | 2018 | 2020 |  |
| Mitsubishi - Jartazi | 2008 | 2008 |  |
| Mobilvetta - Northwave | 1998 | 1999 | |
| Mobilvetta Design - Formaggi Trentini | 2001 | 2002 | |
| Mobilvetta Design - Rossin | 2000 | 2000 | |
| Monkey Town | 2016 | 2019 | |
| Moscow | 2009 | 2010 |  |
| Motorola | 1991 | 1996 | |
| Mr Bookmaker - Palmans | 2004 | 2004 | |
| Mr Bookmaker - SportsTech | 2005 | 2005 | |
