• Cabrakaän (Symphonic / Folk-metal)
• ‡ Cadacross (Melodic/Death/Folk/Metal)
• ‡ Caladmor (Epic Folk-metal)
• Calico Jack (Pirate Folk-metal)
  Cân Bardd (Folk/Black Metal)
• Cantus Levitas (Mittelalter Rock/metal)
• Captain Jack’s Army (Speedfolk)
• ‡ Cat O’ Nine Tail (Pirate metal)
• ‡ Catuvolcus (Folk/Black Metal)
• ‡ Cave Growl (Alcoholic Folk-metal)
• ‡ Caverns of Arnosh (Folk-metal)
• Celestic (Heroic Melodic Death Metal)
• Celkilt (Folk-punk)
• Cellar Darling (Folk-metal)
• Celtachor (Celtic/Folk/Black Metal)
• Celtian (Symphonic Folk-metal)
• Celtibeerian (Folk-metal)
• ‡ Celtibeers (Folk-metal)
• Celtica (Celtic Pipe Rock)
• ‡ Celtic Legacy (Folk-metal)
• Cemican (Prehispanic Folk-metal)
• Ceolskog (Acoustic/Folk-metal)
• ‡ Cerberus (Atmospheric/Folk Metal)
• Cernunnos (Folk-metal)
• Cernunnos’ Folk Band (Folk-metal)
• Chain of Dogs (Folk/Thrash/Punk)
• The Chant of Trees (Mediative Folk-metal)
• Ch’aska (Folk-metal)
• Chur (Folk-metal)
• ‡ Circle J (Folk-punk)
• ‡ Circle of Grief (Gothic Metal/Folk)
• ‡ Circle of Tyrants (Folk/Black Metal)
• Claim the Throne (Melodic/Death/Folk-metal)
• ‡ Clamor Silvae (Folk Viking-metal)
• The Clan (Irish Rock)
• ‡ Clanrock (Folk-metal/Celtic Rock)
• ‡ Cnoc An Tursa (Folk/Black Metal)
• Codex Verus (Medieval Rock)
• ‡ Conorach (Folk/Power Metal)
• Corte di Lunas (Renaissance Celtic Folk Rock)
  Crash Nomada (Folk Punk)
• The Crazy Rogues (Celtic Punk)
• Crescent Lament (Folk-metal)
• ‡ Crimfall (Symph. Power/Folk Metal)
• Cronica (Folk-metal)
• Cruachan (Celtic/Folk Metal)
• Cruadalach (Folk-metal)
• ‡ Cryptic Age (Progressive Folk-metal)
• Crystalmoors (Cantabrian Pagan Metal)
• Cultus Ferox (Medieval Rock)
• ‡ Cumulo Nimbus (Renaissance Metal)
• Curare (Andean Folk-metal)