- Out of Norm -- Outcold
- Outcrowd -- Outlaw Dervish
- Outlaw Gangster -- Outsider
- Outsiders -- Oval Emotion
- Oval Emotion -- Overcoming Faith Music Ministry
- Overcrossing -- Overmaster
- Overmindz -- Ovilon
- Ovipositor -- Owen Harris
- Owen Howard -- Owusu & Green
- Owusu & Hannibal -- Oy
- OY BOYZ -- Ozark Toppers
- Ozawa -- Ozzie
- Ozzie Ahlers -- Ozzie Smith