| 2sonT | Hardcore/Metal | Nafarroa | |
| 4 Villains | Metal/Rock | Bizkaia | |
| A.D | Crossover | Bizkaia | |
| Ad Eternum | Heavy Metal | Bizkaia | |
| Adhur | Pagan Black Metal | Gipuzkoa |
|
| Aehrebelsethe | Black Metal | Bizkaia | |
| Aeroscreamer | Heavy Metal | Araba | |
| Aesthetic | Avantgarde Death Metal | Bizkaia | |
| Aiumeen Basoa | Folk Metal | Gipuzkoa | |
| Ajariguan | Metal/Rock | Nafarroa | |
| Alerta | Metal/Hardcore | Bizkaia | |
| Alma Culter | Heavy Metal | Bizkaia | |
| Altarage | Death Metal | Bizkaia | |
| Amankomun | Thrash/Death Metal | Araba | |
| Anabasa | Metal | Araba | |
| Anakrosis | Brutal Death Metal | Gipuzkoa | |
| Ancient Emblem | Black Metal/Crust | Bizkaia | |
| Ancient Settlers | Melodic Death Metal | Gipuzkoa | |
| Anestesia | Thrashcore | Gipuzkoa | |
| Angeles del Infierno | Heavy Metal | Gipuzkoa | |
| Anker | Metal | Gipuzkoa | |
| Ankerra | Metal | Gipuzkoa | |
| Aquí Mando Yo | Metal | Bizkaia | |
| Ardi Beltza | Thrash Metal | Nafarroa | |
| Arduis | Metal | Bizkaia | |
| Arkhos | Groove Metal | Nafarroa | |
| Arvalastra | Death/Doom Metal | Bizkaia | |
| Asgarth | Heavy Metal | Gipuzkoa | |
| Astigarraga Thrower | Death Metal | Gipuzkoa | |
| Atlas Project | Melodic Death Metal/Groove Metal | Nafarroa |
