Albums starting with O
- O Shudder - Dutch Uncles
- Of Beauty and Rage - Red
- Of Ghosts and Gods - Kataklysm
- OG Maco - OG Maco
- OHIO - Stalley
- Old Cheetah - Hawksley Workman
- Old Souls - Make Them Suffer
- One In The Chamber Music - Headstones
- One Love Revolution - Pillar
- One Man Army - Ensiferum
- One Of A Kind - AER
- One Wild Life Soul - Gungor
- Only To Rise - Sweet & Lynch
- Only Way Is Up - K Camp
- Onward and Sideways - Joshua Radin
- Open Heaven / River Wild - Hillsong Worship
- Open House Vol. 84 - K-Major
- Order Shall Prevail - Jungle Rot
- Organized Crime - Jet Life
- Origin - Dayseeker
- Origins - Eluveitie
- O's To Oscars - Juicy J
- OT - PROBLEM
- Out Of The Wasteland - Lifehouse
- Oxygen - Lincoln Brewster