- O
- OO
- OO
- OOak
- OakObi
- ObiObt
- ObtOce
- OceOct
- OctOdd
- OddODM
- ODOOf
- OfOfn
- OfnOh
- OhOhm
- OhmOK
- OKOkm
- OKOOla
- OlaOld
- OldOli
- OliOll
- OllOly
- OlyOME
- OmeOMP
- OmpOnD
- OneONE
- ONEOne
- OneOnl
- OnlOOJ
- OojOpe
- OpeOpp
- OppOra
- OraOrc
- OrcOre
- OreOri
- OriOri
- OriOrp
- OrpOrs
- OrtOsa
- OsaOse
- OshOss
- OssOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOvi
- OviOwl
- OwlOxy
- OyOzu
- OzuOZZ
- 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
- Overall, Kassa feat. Mvula, Laura & Francis and the Lights
- Overboard
- Overboard (a cappella group)
- Overcast (US metalcore band)
- Overcoats
- Overcome (American christian hardcore)
- Overdawn
- Overdose (Brazilian metal band)
- Overdose TV
- OverDoz.
- Overdream (metal/rock)
- Overdrive (Swedish metal band)
- Overdrive (NWOBHM band)
- OverDrive Division
- Overdrive Orchestra
- Overflash
- Overflow (Croatian punk band)
- Overflow (South Carolina Christian pop/rock band)
- Overground (German boygroup)
- OVERGROUND ACOUSTIC UNDERGROUND
- Overgrown Throne (Chapel Hill, NC punk)
- Overhead (French band)
- Overhead (Finnish progressive rock band)
- Overkill (US thrash metal band fronted by Bobby "Blitz" Ellsworth)
- Overlake
- Overland (band featuring Steve Overland)
- Overland, Steve
- Overlanders, The
- Overload (Swiss Trash-Metal band)
- Overlord (Chilean melodic thrash/death metal)
- Overlorde
- Overlords, The (Danish Synth-pop / EBM / electro / techno / goa trance project)
- Overmars (French metal band)
- Overmaster (Power Metal, Alessandria, Piedmont, Italy)
- Overmono (brothers Tom & Ed Russell (Truss & Tessela))
- Overmono feat. St. Panther
- Overo
- Overpass (successor to California Punk Band 'Slovenly')
- overpass (British band, Birmingham)
- Overrides, The
- Overscene
- Overseer (English DJ/producer)
- Overseer, The (American Christian metal band)
- Overself
- Oversense
- Overshock
- Overslept, The
- OverSoul (chillout)
- OverSoul feat. Gram’ma Funk
- Overstreet (Alt-Pop-Rock project of Chord Overstreet.)
- Overstreet, Chord
- Overstreet, Paul
- Overstreet, Tommy
- Overstreet, Willard
- Overthrone
- Overtime (American hip hop/country)
- Overton, Karen
- Overtones, The (UK founded (from X Factor) vocal harmony group)
- Overtorture (Death Metal from Sweden)
- Overtoun
- Overture (Progressive Metal, Los Angeles, California, United States)
- Overtures (Italian metal band)
- Overtures (Melodic Metal)
- OVERWERK (Canadian DJ)
- OVERWERK feat. MARS
- OVERWERK feat. Nikon, Nick
- Ōverwhelm (Overwhelm)
- Overwhelming Colorfast
- Overworld
- Ovi (Ovidio Crespo, latin urban artist)
- Ovi & Arcángel
- Ovi & De Oro, Omy
- Ovi & Junior H
- Ovi & Mariah Angeliq
- Ovi & Mora
- Ovi & Rene
- Ovi & Uribe, Jessi
- Ovi & Woodz, Miky
- Ovi & Z, Jon
- Ovi, Cano, Natanael, Alemán & Big Soto
- Ovi, Cano, Natanael, Junior H & Herencia de Patrones
- Ovi, Cano, Natanael, Quiles, Justin & Play-N-Skillz
- Ovi, Carrión, Eladio, Cano, Natanael & BadGuyChapo