- Obituary (1293 Hits)
- Obscurity (1966 Hits)
- Officium Triste (913 Hits)
- Omission (821 Hits)
- Onheil (60 Hits)
- Onkel Tom Angelripper (566 Hits)
- Onslaught (1033 Hits)
- Oppressus (1048 Hits)
- Orae (994 Hits)
- Orden Ogan (916 Hits)
- Out For Blood (426 Hits)
- Outrage (JPN) (12 Hits)
- Overkill (920 Hits)
- Ozzy Osbourne (1043 Hits)