- Occupants of Six Across -- Oceanlab
- OCEANLANE -- Ochoa
- Ochosa -- Octamis Prime
- Octane -- Octavio Rodriguez
- Octavio Rojo -- Octogen
- Octogon Man -- Odair & Junior
- Odair Zanella -- Odd Meters
- Odd Meters -- Oddua
- Oddur -- Oder Nice
- Oderigi Lusi -- Odilio Gonzales
- Odilio Gonzalez -- Odoubouzu
- O'Doyle Rules -- Oedo Sukeroku Taiko
- O.E.G. -- Oelberg Kinderchor