Artist
- O'G3NE
- O'Neill
- Oakland Rain
- OCS
- October London
- ODESZA
- Of Mice & Men
- of Montreal
- Offa Rex
- Oh Honey
- Oh Pep!
- Oh Wonder
- OK Kid
- Ólafur Arnalds
- Old Crow Medicine Show
- Old Dominion
- Old Sea Brigade
- Olivia Holt
- Olivia Lane
- Olivia O'Brien
- Ollie Gabriel
- Ollie Green
- Olly Knight
- Olly Murs
- Olsson
- Olympia
- Omar Kadir
- Omar Velasco
- Omer Netzer
- One Last Dance
- ONE OK ROCK
- OneRepublic
- Opetaia Foa'i
- OPETH
- Ori Ronen
- Orla Gartland
- Our Hollow Our Home
- Our Last Night
- Owl City
- Ozuna
- Ozzy Osbourne
