Releases
 | Oathbreaker (2008) hardrock / metal / hardcore Oathbreaker |
 | Oblivion (2007) hardrock / metal / hardcore Emptiness |
|---|---|---|---|
 | Occultus Insanus Damnatus (2009) hardrock / metal / hardcore Insanity reigns supreme |
 | Oh, Comely! (2010) hardrock / metal / hardcore Campus |
 | Old scars fresh wound (2004) hardrock / metal / hardcore Suhrim |
 | Omissa (2017) hardrock / metal / hardcore Powerstroke |
 | On the rise (2002) hardrock / metal / hardcore Downfall |
 | Once more (2012) hardrock / metal / hardcore Beneath Contempt |
 | Once we were kings (2010) hardrock / metal / hardcore Powerstroke |
| Onder de banier van het gewei (2007) hardrock / metal / hardcore Wapenspraak en Drinkgelag |
 | Onderwereld (2021) hardrock / metal / hardcore Haemers |
| One life, one sentence (2005) hardrock / metal / hardcore Angel Crew |
 | Onkruid vergaat niet (2022) nederlandstalige pop, hardrock / metal / hardcore Asermoietuitkomt |
 | Only the dead have seen the end of war (2014) hardrock / metal / hardcore Battalion |
| Operation: Citadel (1999) hardrock / metal / hardcore In-Quest |
 | Ostend Powers (2009) hardrock / metal / hardcore Ostend Powers |
| Our Search (2017) hardrock / metal / hardcore One Step At A Time |
 | Our circle is vicious (2009) hardrock / metal / hardcore Rise and Fall |
| Outcast vs. Moker (2006) hardrock / metal / hardcore Outcast, Moker |
 | Outlast (2017) hardrock / metal / hardcore Moments |
hardrock / metal / hardcore