- Obituary (1293 Hits)
- Obscurity (1964 Hits)
- Officium Triste (912 Hits)
- Omission (819 Hits)
- Onheil (58 Hits)
- Onkel Tom Angelripper (566 Hits)
- Onslaught (1033 Hits)
- Oppressus (1048 Hits)
- Orae (993 Hits)
- Orden Ogan (915 Hits)
- Out For Blood (425 Hits)
- Outrage (JPN) (11 Hits)
- Overkill (920 Hits)
- Ozzy Osbourne (1043 Hits)