- O Captain! My Captain!
- O'Death
- O.W.Wahr
- O/R
- Oakland Rain
- Oates & Attia
- Oberon
- OCandango
- Ocean Onyx
- Octavio Gómez
- Octovianus Tauran
- Odd Magnus Ferkingstad
- Oddess Hecate
- Odds
- Ode
- Oded Noy
- Odett
- Odette
- Odiens
- Odin Schwartz
- Odissey
- OdotKid
- Odyl
- OF1B
- Offchance(onthe)
- Offenses
- Official Sal
- Officina De Andrè
- Ofrin
- Ognibene
- Oh Great Sea
- Oh Jonathan
- Oh Lonesome Me
- Oh Mercy
- Oh! Tiger Mountain
- OH? MARIA
- Ojalá Fly
- Okay Kaya
- Oki
- Oksse
- Ola Alfredsson
- Ola Boro
- Ola Madej
- Olah Ibolya
- Old Joy
- Old Man River
- Olden
- Ole Alfsen
- Ole Halvorsen
- Oleg Pavlishyn
- Olena
- Olga
- Olga Elma
- OLI
- Oli Laroche
- Olis
- Olis
- Olive Daniels
- Olive James
- Oliver
- Oliver alviano
- Oliver Charles
- Oliver Earnest
- Oliver Kronhardt
- Oliver Robbins
- Oliver Samso
- Oliver Scheidies
- Oliver Schott
- Oliver West
- Olivia Carlsson
- Olivia Hudson
- Olivia Newton-John
- Olivia Paris
- Olivia xx
- Olivier
- Olivier Hebert
- Olivier Juprelle
- Olivier Rouquier
- Oliviero Malaspina
- Olle Nyman
- Olle Warm
- Olli Schulz
- Ollie Greg
- Ollie Olson
- Ollie West & The Wildflowers
- OM
- Omar Naber
- Omaster
- Omega
- Omer Kaplan
- Omer Netzer
- ON THE ROCK
- Onalaska
- Ondara
- One Boy Band
- One Million Dollar Band
- One Plus One
- One Way Or Nother
- One-Eyed Mule
- Onelinedrawing
- ONI_ILU
- Onirica
- Onk Lou
- Online Memory
- Only C
- OnlyMescu
- Oona Rea
- Opeliu
- Ophelia
- OR Forrest
- Orange Vibe
- Oren K
- Oren Lavie
- Oren Levin
- Orfeo
- ORIAN
- Orianna
- Origen
- Orkiestra Świętego Wita
- Orlando Andreucci
- Orlando Manfredi
- Orlando Swim Club
- Orlando van Swaay
- Orlando Vitale
- Ornella Vanoni
- Orpheo
- Orris
- Orsakan
- Orso
- Orsola Fortunati
- Ortopilot
- Orxan Merd
- Osaid
- OSCAR
- Oscar Brand
- Oscar Caballero
- Oscar Fagerhov
- Oscar Hannabach
- Oscar LaDell
- Osen Hutasoit
- Oskar Gyllenhammar
- Oskar Nilsson & Krydda Sundström
- Osmo Vänskä
- OtchaYanka
- Otherview
- Otta
- Otti Albietz
- Otto Schellinger
- Otzu Equiz
- Ours
- Out of the room
- Ove & The Lydians
- Over the Rhine
- OVN
- OWBY
- Owen
- Owen Bagwell
- Owen Temple
- Owen Thornton
- Owl
- Owl Collision
- Owl Stretching
- Owls By Nature
- Oxalis
- OXEL!
- Ozark Henry