- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- OBLObv
- obyOce
- OceOch
- OchOct
- OctOdd
- OddOde
- OdeOdi
- Odiodz
- Ofe
- OfeOFF
- OffOgb
- OgdOh
- OhOha
- OhbOi
- OiOjo
- OjoOka
- OkdOku
- OkuOla
- OlaOld
- OldOle
- OleOle
- OleOli
- OliOli
- OliOls
- OlsOma
- OmaOma
- OmaOme
- OmeOMN
- OmnON
- OnOne
- OneOne
- OneOne
- OneOne
- OneONL
- ONLOno
- OnoOog
- OohOpa
- OpaOpe
- OpeOpp
- OppOR
- OROra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- OriOrl
- OrlOro
- OroOrq
- OrqOrt
- OrtOS
- OsOsb
- OsbOSh
- OshOsm
- OsmOst
- OstOte
- OteOTR
- OTROtt
- OttOue
- OueOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOwl
- OwlOxl
- OxlOza
- Ozaozo
- Ozrozz
- Outsiders, Wagner, Django & Poke
- Outskrts (producer Christian Hale and singer-songwriter Brandon Ray)
- Outskrts & Cross, Alaina
- Outsmarting Simon
- Outsound
- Outspoken (Frontman David E. Frazier)
- Outspoken (Hardcore, original band from 1990)
- Outspoken, We
- Outta Control (Canadian euro dance project)
- Outta Pocket (Bay Area hardcore)
- Outta Sites, The (Garage rock fronted by Chris Sprague)
- Outta Space, DJ
- Outtrigger
- Outwaves (4-piece Boston rock band)
- Outwild
- Outwild feat. KC
- Outwork
- Outwork feat. Gee, Mr.
- Outworld (American Progressive Metal Band)
- Ouu
- Ouviña, Dante
- Ouvindo
- Ouvrard, Gaston (fils)
- OUWVAL
- Ouyang Rusli, Lia (Composer, formerly Robert Ouyang Rusli)
- Ouzo Bazooka
- Ov Hell
- Ov Lustra
- Ov Moros
- Ov Pain (New Zealand post punk)
- Ov Ruin
- Ov Ruin & Brojob
- Ov Ruin & Needler, Casey
- Ov Sulfur
- Ov Sulfur feat. Jones, Howard
- Ov Sulfur feat. Medina, Kyle & Schoolcraft, Lindsay
- Ov Sulfur feat. Taylor Barber
- Ov Sulfur feat. Terrible, Alex
- OV3RDRIVE & Tsumyoki
- OV7
- OV7 & JNS
- OV7 & Kabah
- Oval Opus
- Oval Portrait, The
- Ovall
- Ovall feat. Sakai, Yū
- Ovalle, Iván
- Ovalle, Iván & Villazón, Iván
- OVAN (Korean rapper)
- OVAN & VINXEN
- Ovations, The (1960s–70s R&B group)
- Ovations, The (US vocal group from New Jersey)
- OvDeth
- OVE (indie‐pop band from Hamburg, Germany)
- Ovejas Negras, Las
- Ovenden, Julian
- Ovenden, Julian & McPhee, Katharine
- Ovens
- OVEOUS feat. Blank, Tasha
- Oveous Maximus
- OVER ARM THROW
- Over Distortion (Indonesian dirty punk rock band from Sleman, Yogyakarta)
- Over Easy (American DJ/Producer Duo)
- Over Easy & Mehta, Ashley
- Over Easy & MiNDTRiX
- Over Easy, MiNDTRiX & Mehta, Ashley
- Over It
- Over My Dead Body
- Over My Dead Name
- Over October (Filipino pop/alternative rock band)
- Over the Bridge
- Over the Garden Wall (Animated TV Show)
- Over the Moon (French pop duo)
- Over the Ocean (from New York, USA)
- Over the Rhine
- Over the Wall (Glasgow, Scotland)
- Over Time (Croatia instrumental prog)
- Over Under (Band)
- Over, Disco’s feat. Cooke, Jennifer
- Over, Lary
- Over, Lary & Darell
- Over, Lary & Ñejo
- Over, Lary, Amenazzy & Farruko
- Overall, Kassa
- Overall, Kassa feat. Brown, Danny & Wiki
- Overall, Kassa feat. Croker, Theo
- Overall, Kassa feat. Hakim, Nick & Croker, Theo
- Overall, Kassa feat. Hoard, J.
- Overall, Kassa feat. Iyer, Vijay
- Overall, Kassa feat. Lil B, Shabazz Palaces & Francis and the Lights
