| 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 Descent | Melodic Death Metal | Bizkaia | |
| The Eleventh Plague | Deathcore | Bizkaia | |
| The Faithless | Rock/Metal | Araba | |
| The Flying Scarecrow | Rock/Metal | Bizkaia | |
| The Great Wound | Melodic Black/Death Metal | Gipuzkoa | |
| The Hammer Killers | Hard Rock | Bizkaia | |
| The Name | Metal | Bizkaia | |
| The Rodeo Idiot Engine | Metal/Hardcore | Lapurdi | |
| The Space Octopus | Rock/Metal/Prog | Bizkaia | |
| The Wizards | Hard Rock | Bizkaia | |
| Titan | Heavy/Speed Metal | Lapurdi | |
| Toifelthal | Heavy/Hard Rock | Nafarroa | |
| TOMB | Brutal Death Metal | Bizkaia | |
| Torheit | Death/Groove Metal | Nafarroa Beherea | |
| Tracción | Rock/Metal | Nafarroa | |
| Unbound | Heavy Metal | Araba |
