- Obituary (1285 Hits)
- Obscurity (1949 Hits)
- Officium Triste (904 Hits)
- Omission (809 Hits)
- Onheil (49 Hits)
- Onkel Tom Angelripper (559 Hits)
- Onslaught (1024 Hits)
- Oppressus (1041 Hits)
- Orae (985 Hits)
- Orden Ogan (907 Hits)
- Out For Blood (419 Hits)
- Outrage (JPN) (5 Hits)
- Overkill (912 Hits)
- Ozzy Osbourne (1036 Hits)