- O'Reillys And The Paddyhats, The
- O.A.R.
- O.W.S.
- Oasis
- OBERER TOTPUNKT
- Obie Trice
- Oceana
- Ocean Hills
- Ocean Jet
- Oceano
- Oceans
- October Fall
- ODESZA
- Odetari
- Ofdrykkja
- Ofenbach
- Offer Nissim
- Offset
- Offspring
- Offspring, the
- Of Mice & Men
- Of monsters and men
- Of Montreal
- Ofra Haza
- Of the Wand & the Moon
- of Verona
- Of Virtue
- Oh Hellos, the
- Oh Honey
- Oh The Larceny
- Oh Wonder
- Oingo Boingo
- Okean Elzy (Океан Ельзи)
- OK Go
- Okkervil River
- Ol' Dirty Bastard
- Ola
- Olafur Arnalds
- Old Dead Tree, the
- Old Gods of Asgard
- Old Man Canyon
- Olexesh
- Olga Buzova
- Oliver Heldens
- Oliver Heldens & WeiBird
- Oliver Koletzki
- Oliver Tree
- Oliver Tree & Little Big
- Oliver Tree & Robin Schulz
- Olivia Addams
- Olivia Newton-John
- Olivia O'brien
- Olivia Rodrigo
- Olly
- Olly Alexander
- Olly Murs
- Omar & The Howlers
- Omar Apollo
- Omar Courtz & De La Rose
- Omi
- OMNIMAR
- Omnium Gatherum
- On-The-Go
- Once Monsters
- One Bit
- One Desire
- One Direction
- One Less Reason
- One Love
- One Night Only
- One OK Rock
- OneRepublic
- ONUKA
- Onyx
- Oomph!
- Oonagh
- Openwater
- Opeth
- Opus
- Orange Goblin
- Orchestral manoeuvres in the dark (OMD)
- Orden Ogan
- Oren Lavie
- Orgy
- Orianthi
- Orion Experience, the
- Orion White
- Orishas
- Orleans
- Orville Peck, Kylie Minogue & Diplo
- Oscar And The Wolf
- Oscar Anton
- Oscar Benton
- Oscar Ortiz X Edgardo Nuñez
- Ost+Front
- Otep
- Other Lives
- Otherwise
- Otilia
- Otis Redding
- Ottawan
- Our Last Night
- Our Mirage
- Outburst, The
- Outfield, the
- OutKast
- Outlandish
- Overkill
- Owl City
- Ozuna
- Ozzie
- Ozzy Osbourne
- Öwnboss & Sevek