| Orion Child | Power Metal | Bizkaia | |
| Ossyris | Power Metal | Bizkaia | |
| OST | Metal | Bizkaia | |
| Ostots | Black Metal | Bizkaia | |
| Overloud | Hard Rock | Gipuzkoa | |
| Oxido | Heavy Metal | Nafarroa | |
| Ozhen | Hard Rock | Bizkaia | |
| Perpetual Limbo | Thrash/Death Metal | Bizkaia | |
| Perseveranth | Heavy Metal | Araba | |
| Pornox | Nu Metal | Bizkaia | |
| Positiva | Hard Rock | Bizkaia | |
| Potentor | Heavy Metal | Gipuzkoa | |
| Prophetic Scourge | Death Metal | Lapurdi | |
| Quaoar | Progressive Rock/Metal | Bizkaia | |
| RAS | Grindcore/Death | Gipuzkoa | |
| Ready Aim Fire | Hard Rock | Bizkaia | |
| Recreate | Metalcore | Nafarroa | |
| Red Dead | Death Metal | Lapurdi | |
| Reditio | Rock/Metal | Nafarroa | |
| Rezikle | Metal | Gipuzkoa | |
| Rhevent | Heavy Metal | Nafarroa | |
| Rise To Fall | Melodic Death Metal | Bizkaia | |
| Robert Rodrigo Band | Hard Rock | Bizkaia | |
| Rotten Notes | Death/Grindcore | Araba | |
| Sabotaje | Heavy Metal | Bizkaia | |
| Sealed Room | Rock/Metal | Bizkaia | |
| Sen Horx | Rock/Metal | Bizkaia | |
| Sentimen Beltza | Black Metal | Araba | |
| Sepulchral | Death Metal | Bizkaia | |
| Servants Of The Sword | Brutal Death Metal | Gipuzkoa |
