- Ortega (Atmospheric Doom-Netherlands)
- Omerta (PL) (Hardcore-Poland)
- Onrust (NL) (Black Metal-Netherlands)
- Omega (HUN) (Hard Rock-Hungary)
- Ordeal (BEL) (Death Metal-Belgium)
- Omerta (VTN) (Death Thrash-Viêt-Nam)
- Organ: (NOR) (Metal-Norway)
- Omerta (BEL) (Metal-Belgium)
- Orbiter (NOR) (Stoner-Norway)
- Orbiter (FIN) (Stoner Doom-Finland)