O
| Name | Year(s) | Appeared on | Instrument |
|---|---|---|---|
| Patrick O'Hearn | 1978–1984, 1988, 1991, 1992, 1996, 1997, 2003, 2004, 2006, 2008 | Zappa in New York, Sleep Dirt, Sheik Yerbouti, Joe's Garage, Tinseltown Rebellion, Shut Up 'n Play Yer Guitar, Ship Arriving Too Late to Save a Drowning Witch, Baby Snakes, Them or Us, You Can't Do That on Stage Anymore, Vol. 1, You Can't Do That on Stage Anymore, Vol. 4, You Can't Do That on Stage Anymore, Vol. 6, Läther, Frank Zappa Plays the Music of Frank Zappa: A Memorial Tribute, Have I Offended Someone?, Halloween, QuAUDIOPHILIAc, Trance-Fusion, One Shot Deal | Bass, Vocals |
| Lady Bianca | 1978 | You Can't Do That on Stage Anymore, Vol. 4, You Can't Do That on Stage Anymore, Vol. 6, Philly '76 | Vocals and Keyboard |
| David Ocker | 1976, 1981, 1983, 2004 | Sheik Yerbouti, You Are What You Is, London Symphony Orchestra, Vol. 1, QuAUDIOPHILIAc | Clarinet |
| Lucy Offerall | 1987 | Uncle Meat (1987 CD Version) | Voice |
| Rumi Ogawa-Helferich | 1993, 1994, 1999 | The Yellow Shark, Civilization, Phaze III, Everything Is Healing Nicely | Percussions, Vocals |
| Franck Ollu | 1993, 1994, 1999 | The Yellow Shark, Civilization, Phaze III, Everything Is Healing Nicely | Brass, Voice |
| Yoko Ono | 1971, 1992 | Playground Psychotics | Vocals |
| Tony Ortega | 1972, 2004 | The Grand Wazoo, Joe's Domage | Woodwinds |
| Shuggie Otis | 1969 | Hot Rats | Bass |
| Charles M. Owens | 1972, 2007 | Wazoo | Woodwinds |
Read more about this topic: List Of Performers On Frank Zappa Records