- ‡ Macaria (Folk-metal)
- ‡ Mael Mórdha (Folk/Doom Metal)
- Magda Przychodzka (Folk-metal)
- ‡ Maglor (Folk-metal)
- Mago de Oz (Folk/Celtic Metal)
- The Mahones (Celtic Punk)
- ‡ M.A.I.M. (Folk-metal)
- Maladecia (Folk-metal)
- Malasañers (Celtic Punk)
- Mandragora Thuringia (Folk-metal)
- Manntra (Industrial metal / Folk-metal)
- Månegarm (Viking/Black/Folk-metal)
- ‡ Marțolea (Folk/Black metal)
- ‡ MaterDea (Symphonic Folk Metal/Rock)
- The McGonagalls (Celtic Punk)
- McScallywag (Celtic Punk)
- Medved’ (Folk-metal)
- Melechesh (Black/Middle Eastern metal)
- Merkfolk (Folk-metal)
- ‡ Metal Styx (Symphonic Black Folk-metal)
- MetalXis (Instrumentel Folk Melodic Metal)
- ‡ Methysos (Folk-metal)
- Metsatöll (Folk-metal)
- Mickey Rickshaw (Celtic Punk)
- Midgard (Viking/Folk-metal)
- Midnattsol (Melodic/Folk-metal)
- Midvinterblot (Folk-metal)
- ‡ Miellnir (Folk/Viking Metal)
- Mileth (Folk-metal)
- ‡ Minhyriath (Folk/Death Metal)
- ‡ Minos (Folk-metal)
- Minotaurus (Celtic Folk-metal)
- ‡ Minotaur’s Redemption (Folk/Trash)
- Mirrorshield (Power/Folk-metal)
- ‡ The Mist and the Morning Dew (Folk-metal/Doom)
- Mistfolk (Folk-metal)
- ‡ Mithotyn (Viking/Black Metal)
- Mjød (Folk/Viking Metal)
- Moksh (Vedic Metal)
- ‡ Mondstille (Folk/Black Metal)
- ‡ Mondvolland (Folk/Black Metal)
- ‡ Mongol (Folk/Death Metal)
- Moonsorrow (Folk/Pagan/Black Metal)
- Morgarten (Folk/Black Metal)
- ‡ Morgenstern (Folk-metal)
- Morhana (Folk-metal)
- ‡ Moriandum (Folk influenced Black Metal)
- ‡ Morok (Folk-infl. Pagan Black Metal)
- Moriquendi (Atmospheric Folk-metal)
- Mornir (Folk/Pagan Metal)
- ‡ Moss of Moonlight (Black/Folk-metal)
- Motanka (Mystic Metal)
- Mr. Irish Bastard (Folkpunk / Folk-rock)
- Munarheim (Symphonic Dark Folk Metal)
- ‡ Munruthel (Black Pagan Folk-metal)
- Der Münzer (Mittelalter Hardrock)
- ‡ MuyzKKubuN (Folk-metal)
- Myrath (Oriental Folk-infl. Prog. Metal)
- ‡ Myrkgrav (Blackened Folk-metal)
- ‡ Myrkvar (Folk/Viking Metal/Black Metal)
- Myrkvedr (Folk / Viking metal)
- Mysteria Mortis (Pagan/Folk-metal)
- MystTerra (Folk/Industrial/Metal)