Sammy Ogiwara (Japan)
The O'Haras (Borsbeek, Belgium)
The Orangu-Tones (Denver, Colorado)
The Orbitals (San Diego, California)
Orestes Prezza (Campinas, Brazil)
The Oriental Guitars (The Netherlands)
The Outbacks (San Francisco, California)
The Outer Aves (San Francisco, California)
Outer Wave (Huntington Beach, California)
The Overtones (Minneapolis, Minnesota)