| A | B | C | D | E | F | G | H | I | J | K | L | M | N |
| O | P | Q | R | S | T | U | V | W | X | Y | Z |
| O | P | Q | R | S | T | U | V | W | X | Y | Z |
| label | Artyści | year |
|---|---|---|
| Old Temple | Arathyr | 2008 |
| On Parole Productions | Noctiferia | 2014 |
| Opaline Records | Darling Violetta | 1999 |
| Open Sources | Digit All Love | 2007 |
| Orcynia Records | Lethian Dreams | 2012 |
| Org Records | Pure Reason Revolution | 2008 |
| Orofarne Music | Ensoph | 1998 |
| Osasto-A | Fear Of Domination | 2011 |
| Oskorei Productions | Centinex | 1998 |
| Osmose Productions | Absu | 1999 |
| Osmose Productions (2) | Melechesh | 2001 |
| Osmose Productions, Osmose Productions | Absu | 2009 |
| Our Choice | Die Krupps | 1997 |
| Our Choice, Energy Rekords | Die Krupps | 1993 |
| Out Of Line | Aesthetic Perfection | 2011 |
| Out Of Line, Sub/Mission Records | Hocico | 1998 |
| Outsider | Paradox | 2009 |
| Oy EMI Finland Ab | Strapping Young Lad | 2009 |
| Pagan Flames Productions | Mysticum | |
| Pagan Records | Demonic Slaughter | 2014 |
