| 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 | Debiut |
|---|---|---|
| Oasis Records (4), Atlantic | AC/DC | 1981 |
| Obliteration Records | Dead Infection | 1993 |
| Oblivion (2) | Fields Of The Nephilim | 1997 |
| Oblivion (2), SPV GmbH | Umbra Et Imago | 2011 |
| Obscene Productions | Dead Infection | 1998 |
| OBUH Records | Job Karma | 2001 |
| Occultum Production | Opera IX | 2007 |
| Ocean Company S.A. | Kobong | 1997 |
| OctoArts EMI | Deep Purple | 1995 |
| Odeon | Deep Purple | 1968 |
| ODIC Production | Killing Joke | 1990 |
| Odium Records (2) | Black Altar | 1997 |
| Oficyna Biedota | Wieże Fabryk | 2010 |
| Old Europa Cafe | Rosa Rubea | 2011 |
| Old Gold (2) | Japan | 1986 |
| Old Temple | Arathyr | 2008 |
| On Parole Productions | Noctiferia | 2014 |
| Opaline Records | Darling Violetta | 1997 |
| Open Sources | Digit All Love | 2007 |
| Orcynia Records | Lethian Dreams | 2009 |
| Org Records | Pure Reason Revolution | 2008 |
| Orofarne Music | Ensoph | 1998 |
| Osasto-A | Fear Of Domination | 2009 |
| Oskorei Productions | Centinex | 1998 |
| Osmose Productions | Absu | 1993 |
