- The Nuggets -- The Numbers
- The Numbers -- The Nutty Boys
- The Nutty Producer -- The O
- The O -- The Oakville Children's Choir
- The O.A.O.T's -- The Objex
- The Oblique -- The Observers
- The Observers & King Tubby's -- The Occasions
- The Occupants -- the Odd CupL
- The Odd Drawn -- The Odorants
- The Odyssey Favor -- The Officers
- The Official Dunzi & C-Low Swing the Selector -- The Ogd Trio
- The Oggs -- The Ok Rivals
- The Okada Supersound -- The Old Bethpage Brass Band
- The Old Ceremony -- The Old Main
- The Old Man & His Po' Buckra -- The Old-time Music Group
- The Old-Time Radio Gang -- The Olivia Tremor Control
- The Olliephonic Horns -- The Omega Men
- The Omega Trust -- The One
- The One AM Radio -- The O'Neil Twins