| Artist | Year at the Gathering |
| Mac Sabbath | 2019 |
| Mac Lethal | 2018 |
| Mack 10 | 2002, 2005, 2012 |
| Madchild | 2014, 2015, 2017, 2019 |
| Madd Maxxx | 2008, 2022 |
| Madness Has Boy | 2012 |
| Madopelli Music | 2017, 2019 |
| Manganelli | 2018 |
| Manntis | 2005, 2006 |
| Marc Rubben | 2017 |
| Mark Bone | 2019 |
| Mars | 2007, 2008, 2009, 2010, 2011, 2012, 2013 |
| Marz | 2001 |
| Mass Murderaz | 2012 |
| Mastamind | 2010, 2011, 2012, 2013 |
| Mastamindz | 2007, 2008, 2012 |
| Master P | 2012 |
| Mayday | 2012, 2013, 2016, 2017 |
| MC Chris | 2009 |
| MC Hammer | 2011 |
| MC Lars | 2018 |
| MC Viruz | 2017 |
| McNastee | 2007, 2017, 2022 |
| Menace 2 Sobriety | 2007, 2008, 2009, 2010, 2011, 2012, 2018 |
| Mereness | 2019, 2022 |
| Meth | 2019 |
| Method Man & Redman | 2010 |
| MGK | 2015 |
| Mi$ta 420 | 2018 |
| Mic Lordz & Sauce Funky | 2011 |
| Mick Foley | 2011, 2014 |
| Mike Busey | 2019 |
| Mike E. Clark | 2022 |
| Mike Spitz | 2016 |
| Mini Kiss | 2005 |
| Miss Cyainide | 2018 |
| Miss Kisa | 2010, 2011 |
| Miss May I | 2017 |
| Mizt3r Purple | 2009, 2010 |
| Mo Foley | 2012 |
| Molly Gruesome | 2011, 2012, 2014, 2015, 2016 |
| MoneySide Musica | 2019 |
| Moonmen | 2015 |
| Morges | 2006, 2007 |
| Morris Day & The Time | 2019 |
| Motown Rage | 2006, 2007, 2008, 2009, 2012, 2014, 2018, 2019, 2022 |
| Mower | 2006 |
| Mr. Grey | 2014 |
| Mr. Liqz | 2014 |
| Mr?E | 2017 |
| Murda Face | 2013 |
| Murda Mic | 2006, 2007, 2008 |
| Murder Musick | 2017 |
| Mushroomhead | 2007, 2009, 2012, 2015, 2017, 2019, 2022 |
| My Brothers Keeper | 2015 |
| My Own Will | 2019 |
| Mystikal | 2011 |
| Myzery | 2001, 2012, 2013, 2015, 2017, 2018, 2019, 2021 |
