- O
- OO
- OO
- OOak
- OakObe
- ObeObr
- OBSOce
- OceOch
- OchOct
- OctOde
- OdeOdo
- OdoOf
- OfOff
- OffOgr
- OgrOha
- Oiz
- OizOka
- OKAOkw
- OkYOld
- OldOld
- OldOli
- OliOli
- OliOls
- OlsOm
- OmOmi
- OmiOn
- OnOne
- OneOne
- OneOne
- OneOnl
- Onlonu
- OnuOos
- OotOpe
- OpeOpu
- OpuOra
- OraOrc
- OrcOre
- OreOri
- OriOri
- ORIOrn
- OrnOrq
- OrqOrt
- OrtOsb
- Osbosh
- OshOSR
- OssOte
- OteOtt
- Ott
- Ous
- OutOut
- OutOut
- OutOve
- OveOvi
- OviOwi
- OwiOxm
- OxmOzo
- Ozoozz
- Ötzi, DJ & Gott, Karel
- Ötzi, DJ & Hall, Kate
- Ötzi, DJ & Hermes House Band
- Ötzi, DJ & P., Nik
- Ötzi, DJ & P., Nik
- Ötzi, DJ & Pircher, Marc
- Où est le Swimming Pool (English synthpop group)
- Ou2s (french rapper)
- Ouai Stéphane
- Ouaipaul
- Oualid (Dutch rapper/vocalist Oualid Roshdy)
- Oub LCK
- OUBEL
- Oubéret
- Oubliette (melodic black metal band from Tennessee)
- Ouboter, Maaike
- Oud west
- Ouellet, Karim
- Ouellet, Karim feat. Sarahmée
- Ouellet, Yvan
- Ougenweide
- Ought (Canadian post-punk band)
- Oui 3
- Oui lele
- oui merci (Montreal indie rock band)
- 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 du Scorff, Les
- 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)
