| Sorhots | Rock/Metal | Lapurdi | |
| Soulitude | Heavy/Power Metal | Bizkaia | |
| Soziedad Alkoholika | Crossover | Araba | |
| Spl33n | Metal | Lapurdi | |
| Starbeast | Hard rock | Nafarroa | |
| Stolen Soul | Groove Metal | Bizkaia | |
| Su Ta Gar | Heavy Metal | Gipuzkoa | |
| Subjugated | Brutal Death Metal | Bizkaia | |
| Sugoi | Heavy Metal | Bizkaia | |
| Surt Ur | Black Metal | Bizkaia | |
| Sweet Rage | Alt Rock/Metal | Bizkaia | |
| SYO | Post Metal | Bizkaia | |
| T-TreintayCuatro | Heavy Metal | Araba | |
| Taken | Power Metal | Nafarroa | |
| The Blackening | Thrash/Groove Metal | Nafarroa | |
| The Broken Horizon | Metalcore | Nafarroa | |
| The Covenant | Post Metal | Bizkaia | |
| The Flying Scarecrow | Rock/Metal | Bizkaia | |
| The Hellectric Devilz | Heavy Metal | Lapurdi | |
| The Kraven | Groove Metal | Bizkaia | |
| The Name | Metal | Bizkaia | |
| Titan | Heavy Metal | Lapurdi | |
| Toifelthal | Heavy/Hard Rock | Nafarroa | |
| Trannce | Industrial Metal | Gipuzkoa | |
| Tunikah | Black Metal | Gipuzkoa | |
| Txatar | Thrash Metal | Gipuzkoa | |
| Txernobil | Metal | Bizkaia | |
| Txerri Ugerrak | Rap Metal/Hardcore | Bizkaia | |
| Unbound | Heavy Metal | Araba | |
| Urbangrind | Death/Grindcore | Bizkaia |