| Sentimen Beltza | Black Metal | Araba | |
| Sepulchral | Death Metal | Bizkaia | |
| Servants Of The Sword | Brutal Death Metal | Gipuzkoa | |
| Sffera | Heavy Metal | Bizkaia | |
| Shallow Waters | Melodic Doom/Death Metal | Gipuzkoa | |
| Shintra | Post-Metal | Bizkaia | |
| Shrapnel Meat | Thrashcore | Bizkaia | |
| Silent Opera | Symphonic Death Metal | Lapurdi | |
| Sinmas | Thrashcore | Bizkaia | |
| Sixmika | Groove Metal | Araba | |
| Skin Tortured | Death Metal | Bizkaia | |
| SOA | Metal | Gipuzkoa | |
| Sönambula | Doom/Death Metal | Bizkaia | |
| Song Of Anhubis | Rock/Metal | Bizkaia | |
| Sons of Decay | Thrash/Black Metal | Gipuzkoa | |
| Sorgerth | Death Metal | Bizkaia | |
| Soulitude | Heavy/Power Metal | Bizkaia | |
| Soziedad Alkoholika | Crossover | Araba | |
| Spirikom | Death Metal | Nafarroa | |
| Strappado | Brutal Death Metal | Bizkaia | |
| Su Ta Gar | Heavy Metal | Gipuzkoa | |
| Surt Ur | Black Metal | Bizkaia | |
| Sysmo | Death Metal | Bizkaia | |
| T TreintayCuatro | Heavy Metal | Araba | |
| Taken | Power Metal | Nafarroa | |
| The Broken Horizon | Metalcore | Nafarroa | |
| The Crypt | Death/Black Metal | Bizkaia | |
| The Descent | Melodic Death Metal | Bizkaia | |
| The Eleventh Plague | Deathcore | Bizkaia | |
| The Faithless | Rock/Metal | Araba |
