- O
- OO
- OO
- OOak
- OakObe
- ObeObs
- ObsOce
- OceOCS
- OCSOda
- OdaODE
- ODEODU
- ODUOfe
- OfeOfr
- oftOh
- OhOhj
- OHKOji
- OJMOke
- OkeOla
- OlaOld
- OldOle
- OleOli
- OliOll
- OllOm
- OmOme
- OmeOmn
- OmnOnc
- One
- OneOne
- OneOni
- ONIOno
- OnoOon
- OonOpe
- OpeOpt
- Ora
- OraOrc
- OrcOrd
- OrdOrg
- OrhOri
- OriOrm
- OrmOrq
- OrqOrt
- OrtOsb
- OsbOsh
- OshOss
- OssOTF
- OtgOtt
- OttOue
- OueOut
- OutOut
- OutOut
- OutOve
- OveOwe
- OweOwn
- OwsOza
- OzaOZZ
- Ouellet, Karim feat. Sarahmée
- Ouellet, Yvan
- Ougenweide
- Ought (Canadian post-punk band)
- Oui 3
- Oui lele
- Ouija Macc
- Ouijabeard (Rock, Hardrock, Metall)
- Ouimette, Steve
- Oulton, Quinn
- Oum (Oum el Ghaït Benessahraoui)
- Oum Shatt
- Oumar (French rapper Oumar Magassa)
- Oumou Dioubate
- Oumua
- Ounsworth, Alec
- Our 11th Hour (Progressive Rock Group from Syracuse, NY)
- Our Broken Garden
- Our Brother the Native
- Our Ceasing Voice
- Our Ceasing Voice & Ryan, Matthew
- Our Dementia Choir
- our distant worlds
- Our Fears
- Our Future Leaders
- Our Girl
- Our Heart’s Hero
- Our Hollow, Our Home
- Our Lady Peace
- Our Lady Peace feat. Jones, Elvin
- Our Lady Peace feat. Pussy Riot
- Our Lady Peace featuring Jones, Elvin
- Our Last Enemy (industrial metal)
- Our Last Night
- Our Little Secrets
- Our Loss Is Total
- Our Lost Infantry (Progressive/Post-rock/Pop)
- Our Man in the Bronze Age
- Our Martyred Lady
- Our Mirage
- Our Mirage feat. Smith, Tyler
- Our Native Daughters (groups comprised of Rhiannon Giddens, Leyla McCalla, Allison Russell and Amythyst Kiah)
- Our Natural Killer feat. Holy Txala
- Our Oceans
- Our Past Days
- Our People Versus Yours
- Our Promise
- Our Royal Displeasure
- Our Stolen Theory (Finnish group)
- Our Sunday Affairs
- Our Theory (French rock band from Paris)
- Our Vices
- Our Waking Hour
- Ouri
- Ourlives
- Ournac, Thomas
- Ouroboros (Australian technical death metal band)
- OurR (k-pop group)
- Ours (rock band led by singer Jimmy Gnecco)
- Ours (real name: Charles Souchon)
- Ours (French band)
- Ours Samplus
- Ourself Beside Me
- Ourselves (Swiss rock band)
- Ousanousava (groupe de musique réunionnais)
- Ouse
- Ouse & Powfu
- Ouse Morrer
- Ouska (instrumental hip‐hop artist)
- Ouss (Swiss Rapper)
- Out Came the Wolves
- Out Cold (Simon Aldred)
- Out Crowd, The
- Out for Justice (Hardcore band from NY)
- Out Hud
- Out in Front
- Out Liars
- Out Lines
- Out of Eden
- Out of Focus (German Krautrock rock fusion band)
- Out of Grace (Dutch 1990s/2000 trance duo)
- Out of Hand (Punk band from Oshawa, Ontario, Canada)
- Out of My Hair
- Out of Office
- Out of Phase
- Out of Service
- Out of Sight (electronic, Jesper Sidelmann & Michael Linde, "Comfort")
- Out of Sight (UK pop punk band)
- Out of the Ashes
- Out of the Blue (The Oxford University acapella group)
