| O Veux | O Veux | none | Not on Label (self-released) | 0 | Belgium | Tape |
| O Veux | Profound Profane | Vanished Tapes VAT 2 | | 1982 | Belgium | Tape |
| O Veux | untitled | Not On Label, none | Not on Label (self-released) | 0 | France | Tape |
| O Yuki Conjugate | Into Dark Water | Final Image, FIB 4 | Final Image | 1987 | United Kingdom | Tape |
| O Yuki Conjugate | Into Dark Water | Final Image, FIB 4 | Final Image | 1984 | United Kingdom | Vinyl Lp |
| O Yuki Conjugate | Peyote | Projekt, PRO33 | Projekt | 1991 | United States | Tape |
| O Yuki Conjugate | Promo-Tape | Final Image | Final Image | 1983 | United Kingdom | Tape |
| O Yuki Conjugate | Scene In Mirage | A-Mission Records, numb 18:18 | A-Mission Records | 1984 | United Kingdom | Vinyl Lp |
| O Yuki Conjugate | Scene In Mirage / Soundtracks | Final Image, FIC 7 | Final Image | 1985 | United Kingdom | Tape |
| O Yuki Conjugate | Untitled | Staalplaat, ST 001 | Staalplaat | 1995 | Netherlands | Vinyl 7" |
| O!Kult | Razredni Boj Je Edino Gibalo Zgodovine | Galerija ŠKUC Izdaja | Galerija ŠKUC Izdaja | 1983 | | Tape |
| O'Nancy In French | O'Nancy In French | AQM 104 | AQM | 1984 | Japan | Tape |
| O-Veux & Coyote And The Lost Dakotas | Live Molen Alken Mei 1985 | nude 13 | Nude Records | 1985 | Belgium | Tape |
| O. Olsen | Solo Recordings | Extreme, DEX 4666 | Extreme | 1987 | Australia | Tape |
| O. Olson | Solo Recordings | Extreme DEX 4666 (AUS), FT. MURPHY, MARIE HOY | Extreme | 1987 | Australia | Tape |
| O.C. Last | Retreat | Lucky Baby Retreat House | Lucky Baby Retreat House | 1986 | United States | Tape |
| O.F.I. | Kill 'Em All Let God Sort Them Out | Artaman, 6 | Artaman | 1986 | United Kingdom | Tape |
| O.I.P. | Underground Man Appear In Tokyo | AUDIOFILE TAPES 182 FROM OKANIWA FUMIHIRO KIND OF DELIRIUM TREMENS | audiofile Tapes | 1994 | United States | Tape |
| O.R.D.U.C. | Fast Forward Special Sampler Cassette | New Bulwark Records & Tapes, 201-8116 | New Bulwark Records & Tapes | 1981 | Netherlands | Tape |
| O.R.D.U.C. | New Cubism | New Bulwark Records & Tapes 202-8126 | New Bulwark Records & Tapes | 1981 | Netherlands | Tape |
| O.R.D.U.C. | Pink & Purple | New Bulwark Records & Tapes 111-8108 | New Bulwark Records & Tapes | 1981 | Netherlands | Vinyl Lp |
| O.R.D.U.C. | Pink & Purple (blue) | New Bulwark Records & Tapes 111-8108 | New Bulwark Records & Tapes | 1981 | Netherlands | Vinyl Lp |
| O.R.D.U.C. | pre Pink and Purple | New Bulwark Records & Tapes 203-8101 | New Bulwark Records & Tapes | 1981 | Netherlands | Tape |
| O.R.D.U.C. | The Beatear | New Bulwark Records & Tapes 202-8403 | New Bulwark Records & Tapes | 1984 | Netherlands | Tape |
| O.T.H. | Coeur Et Cuir | Kronchtadt Tapes, KT 400 | Kronchtadt Tapes | 1985 | France | Tape |
| O.T.O.B (Bert Papenfuß) | Unfugs Beginnens Verrichtung | none | Not on Label (self-released) | 1984 | France | Tape |
| Ob Minimax | NOX | Centraal Tapes, CT05 | Centraal Tapes | 1983 | Netherlands | Tape |
| Oberon | Oberon | Music & Elsewhere; M&E 396 | Music & Elsewhere | 1997 | United Kingdom | Tape |
| Oblique | 1 | Self-released | Not on Label (self-released) | 1983 | Australia | Tape |
| Oblique | 2 | none | Not on Label (self-released) | 1983 | Australia | Tape |
| Oblivians | Popular Favorites | Crypt Records CR-065 | | 1996 | Germany | Vinyl Lp |
| Oblivious Scientist | Sounds for Nestra | SIlver Wheel Music | SIlver Wheel Music | 1997 | United States | Tape |
| Obscurity Age | Obscurity Age | THX 1138 - none | Amen - THX 1138 | 1984 | Italy | Tape |
| Observation Clinique | The Mental Answer 1 | Recloose Organisation, Loose 003 A | Recloose Organisation | 1984 | United Kingdom | Tape |
| Obvious Enesov | | | | 0 | | Tape |
| Obvious Enesov | Groin | Alternative Capitalists, ACC 003 | Alternative Capitalists | 1980 | United Kingdom | Tape |
| Ocarina Orchestra | It Must Have Been the Candle / Most Holy Redeemer | New Wilderness Audiographics, 8126A | New Wilderness Audiographics | 0 | | Tape |
| Ocarina Orchestra | Ocarina Orchestra | New Wilderness Audiographics, 8126A | New Wilderness Audiographics | 1980 | United States | Tape |
| Occupant | No Specific Answer | none | Not on Label (self-released) | 1984 | United States | Tape |
| Octopus | Octopus | ESP-Disk, 2000 | | 1970 | United States | Vinyl Lp |
| Octopus's Garden | Chronicles Of A Lost Land | Electronical Dreams; 046 | Electronical Dreams | 1995 | United Kingdom | Tape |
| Odal | Against Humanity | Lor Teeps, 29 | Lor Teeps | 1988 | Netherlands | Tape |
| Odal | Black | BloedvlagProdukt | BloedvlagProdukt | 1986 | Netherlands | Tape |
| Odal | Desintegration | Industrial Therapy Unit i.t.u.12, Nihilistic Recordings none | Industrial Therapy Unit | 1988 | United States | Tape |
| Odal | Disguised Renewal | Interrupt Products | Interrupt Products | 1989 | United States | Tape |
| Odal | Groeitrauma | Nihilistic Recordings,NhR083 | Nihilistic Recordings | 1987 | Netherlands | Tape |
| Odal | Interferon | Nihilistic Recordings, NhR015 | Nihilistic Recordings | 1987 | Netherlands | Tape |
| Odal | Lenin Stinkt | Nihilistic Recordings, NhR035 | Nihilistic Recordings | 1987 | Netherlands | Tape |
| Odal | Moral Majority | Nihilistic Recordings | Nihilistic Recordings | 0 | Netherlands | Tape |
| Odal | Nihilist Dogs | BloedvlagProdukt | BloedvlagProdukt | 1986 | Netherlands | Tape |
| Odal | No Big Bang | Sounds for Consciousness Rape SFCR 14 (F), SOUNDS TO MEDITATE ON INFINITY, SPECIAL PACKAGING | Sounds For Consciousness Rape | 1990 | France | Tape |
| Odal | Onzuiver Bloed | Industrial Therapy Unit i.t.u. 4 | Industrial Therapy Unit | 1987 | Canada | Tape |
| Odal | Positiv Soundsculptures | BloedvlagProdukt | BloedvlagProdukt | 1986 | Netherlands | Tape |
| Odal | Potent | BloedvlagProdukt | BloedvlagProdukt | 1986 | Netherlands | Tape |
| Odal | Potent | Nihilistic Recordings; NhR 007 | Nihilistic Recordings | 1986 | Netherlands | Tape |
| Odal | Potent | Opus Dei, OPUS 16 | Opus Die Society | 1986 | Netherlands | Tape |
| Odal | The Choice Of A New Generation | Korm Plastics, Kp 487 | Korm Plastics | 1987 | Netherlands | Tape |
| Odal | The Choice Of A New Generation | Korm Plastics kp 487 | Korm Plastics | 1987 | Netherlands | Tape-2 |
| Odal | TV Art | BloedvlagProdukt | BloedvlagProdukt | 1986 | Netherlands | Tape |
| Odal and Due Process | Independence Day Celebration | Nihilistic Recordings, NhR054 | Nihilistic Recordings | 0 | Netherlands | Tape |
| Odal In Collaboration With Üriniglirimirnaglü | ..Meets S.S. Bla! | Nihilistic Recordings, NhR011 | Nihilistic Recordings | 1987 | Netherlands | Tape |
| Ode FIlipica | Janusjus | SPH, SPH022 | SPH | 0 | Portugal | Tape |
| Odessa | Attente | Murnau Records, MUR 001 | | 1984 | France | Vinyl 7" |
| Odessa | promo tape n°3 | none | Not on Label (self-released) | 1983 | France | Tape |
| Odessa | promo tape n°5 | none | Not on Label (self-released) | 1983 | France | Tape |
| Odvazna Srdce / R.D.M. | Skeptical? Eat This Tape Now! | | Not on Label (self-released) | 0 | | Tape |
| Oeleo | Sea of Nectar | none | Not on Label (self-released) | 1996 | United States | Tape |
| Off & Out | Deep Inside | Zytvertrieb EBS 8405 0007 | | 1984 | Switzerland | Vinyl Lp |
| Off (with Sven Väth) | Organisation For Fun | ZYX Records – ZYX 20.100 | | 1988 | Germany | Vinyl Lp |
| Off (with Sven Väth) | Organisation For Fun | Clever House Of Music 23209-1 | | 1988 | France | Vinyl Lp |
| Off Band | All these Planets | Hoersten Tapes | Hörsten Tapes | 1983 | Germany | Tape |
| Off Band | Links Wo Das Herz Ist (as Off Band und die Waffelschmiede) | none | Not on Label (self-released) | 1987 | Germany | Vinyl Lp |
| Off Band | Live in Hollywood | Hoersten Tapes | Hörsten Tapes | 1983 | Germany | Tape |
| Off Band | Nummer 5 | Hoersten Tapes | Hörsten Tapes | 1983 | Germany | Tape |
| Off Band | Off Band | Hörsten Tapes | Hörsten Tapes | 1982 | Germany | Tape |
| Off Band | Tape Nr.7/1985 | Hoersten Tapes | Hörsten Tapes | 1985 | Germany | Tape |
| Off Band | The Off Band Und Waffelschmiede | Not On Label, none | Not on Label (self-released) | 1983 | Germany | Tape |
| Off Band | The Red Soundtrack | Hörsten Tapes | Hörsten Tapes | 1985 | Germany | Tape |
| Off Band | We Are Not the Residents | Hoersten Tapes | Hörsten Tapes | 1983 | Germany | Tape |
| Off Music | Don't ask why / Suspicious / Steel Hotel / Toshiba | Hoersten Tapes | Hörsten Tapes | 0 | Germany | Tape |
| Offbeats | I Can See Your House From Here | St. Valentine Records, SVR-002 | | 1985 | United States | Vinyl 7" |
| Officer! (Mick Hobbs) | 8 New Songs By Mick Hobbs | AAA C01 | AAA | 1983 | France | Tape |
| Officine Schwartz | Colonna Sonora Di Remanium Dentaurum | U.T. Comunicazioni – UT 0003 | | 1988 | Italy | Vinyl Lp |
| Officine Schwartz | Rambo / Fräulein | Sub-Up-Records UP! 04 | | 1987 | Germany | Vinyl 12" |
| Officine Schwartz & DsorDNE | In Concerto A El Paso | Nautilus, El Paso | Nautilus | 1989 | France | Tape |
| Offspring | same | Raz Recordings 003 | RAZ Recordings | 1989 | United States | Tape |
| Ogo | Alter Ego | BInaria; 0001 | Binaria | 1997 | Mexico | Tape |
| OH 78 | Üzähögün | none | Not on Label (self-released) | 1979 | Germany | Tape |
| OH 87 (Offensive Herbst 87) | Live 82, Reutlingen | Volltreffer | Volltreffer | 1983 | Germany | Tape |
| OH 87 (Offensive Herbst 87) | Zu Keiner Zeit | Heimat Records, HR 002 | Heimat Records | 1981 | Germany | Vinyl 7" |
| Ohbi Daka | Why Russia Is Better In Space | ZH27 124 | ZH27 | 1988 | United States | Tape |
| Ohi Ho Bang Bang | The Three | Not defined Yet | Not defined Yet | 0 | | Video |
| OHL | 1000 Kreuze | Rock-O-Rama Records, RRR 12 | | 1982 | Germany | Vinyl Lp |
| OHL | Demos & Live | none | Not on Label (self-released) | 1981 | Germany | Tape |
| OHL | Heimatfront | Rock-O-Rama Records RRR 6 | | 1981 | Germany | Vinyl Lp |
| Ohne Unter Titel (O.U.T. Production) | Heidiland | Das Cassetten Combinat, 81 016 | Das Cassetten Combinat | 1981 | Germany | Tape |
| Ohne Unter Titel (O.U.T. Production) | Ihr Könnt Uns Nicht Töten | Das Cassetten Combinat, 81 017 | Das Cassetten Combinat | 1981 | Germany | Tape |
| Ohne Unter Titel (O.U.T. Production) | In Aller Munde (blue or yellow cover) | Das Cassetten Combinat, 81 0113 | Das Cassetten Combinat | 1981 | Germany | Tape |
| Ohne Unter Titel (O.U.T. Production) | Kopfmassage History in Karanganda | Das Cassetten Combinat, 81 011 | Das Cassetten Combinat | 1981 | Germany | Tape |
| Ohne Unter Titel (O.U.T. Production) | Live Boots Mono | none | Not on Label (self-released) | 1981 | Germany | Tape |