| Band | Genre |
|---|---|
| Machine Head | Thrash Metal |
| Mad Max | Heavy metal |
| Madball | Black/Death Metal/Hardcore |
| Majesty (Metalforce) | Heavy metal |
| Manfred Mann's Earth Band | Rock |
| Manilla Road | Heavy metal |
| Manowar | Heavy metal |
| Manticora | Progressive Metal |
| Mantus | Gothic Metal |
| Marc Rizzo | Instrumental Rock |
| Marillion | Rock |
| Marilyn Manson | Industrial Rock |
| Marty Friedman | Instrumental Rock |
| Masterplan | Power Metal |
| Mastodon | Progressive Metal |
| Mayhem | Black/Death Metal/Hardcore |
| Megadeth | Thrash Metal |
| Mercyful Fate | Heavy metal |
| Meshuggah | Thrash Metal |
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