- O
- OO
- OO
- OO
- OOak
- OakOb
- ObObl
- OblOC
- OCOce
- OCEOct
- OctOcu
- OcuOdd
- OddOdi
- OdiODZ
- OeOff
- OffOff
- Offogo
- ogoOh
- OhOHN
- OhnOje
- OjeOKA
- OKAOku
- OkuOla
- OlaOld
- OldOle
- OleOli
- OliOli
- OliOls
- Ols
- OmaOme
- OmeOmn
- OmnOna
- OnaOne
- OneONE
- Oneone
- OneONI
- OniOnl
- OnlOny
- OnyOos
- OosOpe
- OpeOpp
- OprORA
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- OriOrm
- OrmOrq
- OrqOrs
- OrsOru
- Osb
- OsbOse
- OseOsm
- OsmOst
- OstOth
- OthOtt
- OttOty
- OtyOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOvi
- OviOwe
- OweOxa
- OxbOZ
- Oz
- ozz
- Outta Pocket (Bay Area Hardcore)
- Outtrigger
- 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 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
- OV7
- Oval Opus
- Oval Portrait, The
- Ovall
- Ovall feat. Sakai, Yū
- Ovalle, Iván
- Ovalle, Iván & Villazón, Iván
- OVAN (Korean rapper)
- Ovations, The (1960s–70s R&B group)
- Ovations, The (US vocal group from New Jersey)
- OVCOCO
- OvDeth
- OVE (indie‐pop band from Hamburg, Germany)
- Ovejas Negras, Las
- Ovejas Negras, Las feat. Ñengo Flow
- Ovenden, Julian & McPhee, Katharine
- Ovens
- OVEOUS feat. Blank, Tasha
- OVER ARM THROW
- 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 Under (Band)
- 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
- Overall, Kassa feat. Mvula, Laura & Francis and the Lights
- Overbey, Charlie
- Overboard
- Overboard (a cappella group)
- Overcast (US metalcore band)
- OverClocked Plaid Muffins, The
- 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
- Overdrivers
- Overflash
- Overflow (Croatian punk band)
