- Omar Rodriguez-lopez
- Omar Roldan
- Omar Ruiz
- Omar Salas
- Omar Shane
- Omar Viazcán
- Omara Portuondo
- Omarion
- Omc
- Omd
- Omega
- Omega Diatribe
- Omega Lithium
- Omen
- Omertah
- Omfg
- Omi
- Omid 16b
- Omid Zonfonoun
- Ominous Grief
- Omnia
- Omnibus
- Omnisoul
- Omnium Gatherum
- OMW
- On An On
- On Broken Wings
- On Off
- On The Last Day
- On The Might Of Princes
- On The Roof
- On Thorns I Lay
- Ona
- Onaf
- Onbeskaamd
- Once
- Once Dead
- Once Nothing
- Once Tiros
- Onda Sabanera
- Onda Vaga
- Onda Vaselina
- Ondina
- One Bad Son
- One Block Radius
- One Buck Short
- One Bullet Left
- One Church Gloucester
- One Day
- One Day As A Lion
