- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeOBL
- OBNOC
- Ocaoce
- OceOco
- OcoOct
- Octodd
- ODDODE
- ODEOdo
- OdoOf
- OfOff
- OffOff
- OffOgr
- OgrOh
- OHOhm
- OhmOiz
- OizOka
- OkaOkl
- OklOla
- OlaOld
- OldOld
- OldOle
- OleOli
- OliOli
- OliOlo
- OloOly
- OlyOm
- OmOme
- OmeOmn
- OmnOn
- OnOne
- OneOne
- OneOne
- OneOne
- OneONL
- ONLOno
- OnoOoh
- OohOpa
- OpaOpe
- OpeOpp
- OppOra
- ORAOra
- OraOrb
- OrcOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- OriOrl
- OrlOrp
- OrpOrq
- OrqOrt
- OrtOs
- OSOsc
- OscOsi
- OsiOso
- OspOsw
- OswOth
- OthOtt
- OttOtt
- ottOur
- OurOut
- OutOut
- OutOut
- OutOVA
- OvaOve
- OveOvn
- OvnOwe
- OweOxf
- OxfOz
- OzOzo
- Ozoozz
- Orchestre de Paris, Ozawa, Seiji
- Orchestre du Festival de Lucerne, Furtwängler, Wilhelm
- Orchestre du Soleil (associated with Ed Starink)
- Orchestre Ducoin
- Orchestre International du Vetex (Belgian brassband)
- Orchestre Makassy
- Orchestre Mont‐Blanc
- Orchestre National de Barbès
- Orchestre national de France (RTF / ORTF / Radio France)
- Orchestre national de France, Maazel, Lorin
- Orchestre national de France, Ozawa, Seiji
- Orchestre National de Jazz
- Orchestre national de Lyon
- Orchestre national du Capitole de Toulouse, Plasson, Michel
- Orchestre national du Capitole de Toulouse, Plasson, Michel
- Orchestre National du Tatarstan
- Orchestre philharmonique de Paris, Cosma, Vladimir
- Orchestre philharmonique de Radio France, Järvi, Paavo
- Orchestre philharmonique de Strasbourg, Lombard, Alain
- Orchestre Révolutionnaire et Romantique, Gardiner, John Eliot, Sir
- Orchestre Royal de Chambre de Wallonie & Brossé, Dirk
- Orchestre symphonique de Montréal & Dutoit, Charles
- Orchestre symphonique de Montréal, Dutoit, Charles
- Orchestre symphonique de Québec
- Orchid (American screamo band)
- Orchid (American doom metal group)
- Orchid (eldia associate)
- Orchid feat. Simply Funk
- orchid mantis
- orchid mantis & Fog Lake
- orchid mantis ft. Jordana
- orchid mantis ft. Semones, Mei
- orchid mantis ft. sign crushes motorist
- orchid mantis ft. Yozora, Marina
- Orchid Throne
- orchid, hiss
- Orchidae (Yolande Laroche)
- Orchidelia
- Orchids, The (Sarah Records)
- Orchids, The (Kim Fowley managed group)
- Orchids, The (US female group from New York)
- Orchivion
- Orcivus
- Orcus (Philadelphia)
- Orcustus (Norwegian black metal)
- Orcutt, Bill & Fratti, Mabe
- Ord, Boris
- Ord, Maren
- Ordeal, The (German heavy/power metal band from Hannover)
- ORDEM
- Orden Mundial
- Orden Ogan
- Orden Ogan feat. Diehl, Dennis
- Orden Ogan feat. Eriksson, Ylva
- Orden Ogan feat. Frank Beck & Thompson, Ross
- Orden Shiitake, La
- Ordén, Janne
- Order (Norwegian Black Metal)
- Order From Chaos
- Order of Apollyon, The
- Order of Elijah, The (Joplin, MO)
- Order of Elimination
- Order of Ennead
- Order of Israfel, The
- Order of Nine
- Order of the 12, The (group led by Richard Norris)
- Order of the Ebon Hand (Greece / Black Metal)
- Order of the Fallen
- Order of the Fly, The
- Order of Týr
- Order of Voices
- Order, The (Hard 'n' Heavy, Switzerland)
- Order89 (Parisian darkwave trio)
- Ordge, Jimmy Arthur (Canada)
- Ordher, The
- Ordinaires, The (USA band)
- Ordinance (USA progressive death metal)
- Ordinarius
- Ordinary Boys, The
- Ordinary Elephant
- Ordinary People (New Jersey)
- Ordinary Peoples
- Ordinary Surfers
- Ordinary Time
- Ordinul Negru
- Ordo Equilibrio
- Ordo Equitum Solis
- Ordo M’era Luna
- Ordo Rosarius Equilibrio
- Ordo Rosarius Equilibrio feat. Spiritual Front
