- Omega Mantra -- Omero Mumba
- Omerod -- Ommm
- Ommy -- Omo Jesu
- Omocha S -- On Blast
- On Bodies -- On The Air
- On the Brink -- Ona Jauneikiene
- Ona Kamu -- Once Tasted Life
- Once Through -- Ondrej Kukal
- Ondrej Lenárd -- One Block Radius
- One Blood -- One-Eyed Jack
- One Eyed Jacks -- One Hun
- One Hundred Days -- One Love Massive
- One Lucid Dream -- One Man Sun