- Obskuria
- Obs'n
- Obsoleet
- Obsolete Architect
- Obsolete Heart
- Obsolete Music Technology
- Obst Obscure
- Obstacle
- Obstawa Prezydenta
- Obsydian Tears
- Obszön Geschöpf
- Obszön Geschöpf
- Obtained Enslavement
- Obtane
- Obtwon
- OBurna
- Obús
- Obvious
- Obvious Question
- Obviously High
- OBX
- O.B.X.
- Obywatel G.C.
- Obzcure
- OC
- O.C.
- O.C.
- OC & AG
- O.C. (DITC)
- OC Dre
- O.C. Groceries
- O.C. Montana
- O.C., Rasco
- O.C. Smith
- O.C. Supertones
- OC Times
- OC Tolbert
- Oc Toons
- OC3
- O.C.A.D.
- O'Callaghan
- O'Callaghan & Kearney
- O'Callaghan & Kearney
- Ocarina
- O'Carolan
- Ocasek
- Ocasiòn
- Ocasion JF
- OCB
- Occams Razor
- Occasion
- Occasional
- Occasional Milkshake
- Occasional Monster
- Occasional String Band
- Occasional Word Ensemble
- Occide Jeanty
- Occidens
- Occidental