- Ojo De Buey
- Ojos De Brujo
- Ojos Locos
- Ok Go
- Ok Kid
- OK Maguey
- Ok Sweetheart
- Okan Ersan
- Okay
- Okaysions
- Okean Elzy
- Oki Doki
- Okidoky
- Okills
- Okkervil River
- Okoume
- Oksana Grigorieva
- Okta Logue
- Oktaves
- Oktetas
- Oktobar 1864
- Oktoberklub
- Okuda Miwako
- Ol Dirty Bastard
- Ola
- Ola Aurell
- Ola Bremnes
- Ola Magnell
- Ola Podrida
- Ola Svensson
- Olaf Deriglasoff
- Olaf Henning
- Olaf Schubert
- Olafur Arnalds
- Olan
- Olav
- Olavi Uusivirta
- Old 97s
- Old And In The Way
- Old Canes
- Old Crow Medicine Show
- Old Dominion
- Old Fashion Knife Fight
- Old Friend's
- Old Gods Of Asgard
- Old Grandad
- Old Gray
- Old Man Canyon
- Old Man Gloom
- Old Man Luedecke