| Fiachna O'Braonain (gtr) | Hothouse Flowers |
| Ed O'Brien (gtr, vcls) | Radiohead |
| Frenchy O'Brien (drms) | Animotion |
| Roland O'Brien (drms) | Casuals |
| Sinead O'Carroll (kbds) | B*Witched |
| 'Danny Boy' O'Conner (vcls) | House Of Pain |
| Des O'Connor (vcls) | Roger Whittaker & Des O'Connor |
| John O'Connor | Firm |
| Des O'Connor (vcls) | Des O'Connor |
| Hazel O'Connor (vcls) | Hazel O'Connor |
| Sinead O'Connor (vcls) | Sinead O'Connor |
| Roger O'Dell | Shakatak |
| Daniel O'Donnell (vcls) | Daniel O'Donnell |
| Pete O'Flattery (bs) | Simon Dupree & The Big Sound |
| Brian O'Hara | Fourmost |
| Helen O'Hara (vln, vcls) | Dexy's Midnight Runners |
| Helen O'Hara (vln, vcls) | Dexy's Midnight Runners & The Emerald Express |
| Stig O'Hara [=Ricky Fataar] (gtr, vcls) | Rutles |
| Brian O'Hara (ld gtr) | Fourmost |
| Tony O'Malley (kbds) | 10cc |
| Liam O'Maonlai (vcls) | Hothouse Flowers |
| Jo O'Meara (vcls) | S Club 7 |
| Alexander O'Neal (vcls) | Cherrelle & Alexander O'Neal |
| Alexander O'Neal (vcls) | Alexander O'Neal |
| Damian O'Neill (gtr) | Undertones |
| John O'Neill (gtr) | Undertones |
| Keith O'Neill (drms) | Cast |
| Mike 'Nero' O'Neill (kbds) | Nero & The Gladiators |
| Dolores O'Riordan (vcls, ac gtr) | Cranberries |
| Jimmy O'Rourke | John Fred & His Playboy Band |
| Gilbert O'Sullivan (vcls, pno) | Gilbert O'Sullivan |
| Kevin O'Toole (prod) | N-Trance |
| Kevin O'Toole | N-Trance & Rod Stewart |
| Kevin O'Toole | N-Trance & Ricardo Da Force |
| Mark O'Toole (bs) | Frankie Goes To Hollywood |
| Peter O'Toole (bs) | Hothouse Flowers |
| Terry O'Toole (pno) | Mojos |
| Karen O (vcls) | Yeah Yeah Yeahs |
| O-Jay | MC Star & The Real McCoy |
| Kelly O-Keefe (vcls) | Deuce |
| Paul Oakenfold (prod) | Grace |
| Paul Oakenfold (prod) | Perfecto Allstarz |
| Paul Oakenfold (prod) | Element Four |
| Richard Oakes (gtr, pno) | Suede |
| Trevor Oakes (gtr) | Showaddywaddy |
| Phil Oakey (vcls) | Giorgio Moroder & Phil Oakey |
| Philip Oakey (vcls) | Human League |
| John Oates (vcls, gtr) | Daryl Hall & John Oates |
| Ric Ocasek [=Richard Otcasek] (vcls, gtr) | Cars |
| Billy Ocean (vcls) | Billy Ocean |
| Bill Oddie (vcls, gtr) | Goodies |
| Abi Ofarim (vcl) | Esther & Abi Ofarim |
| Esther Ofarim (vcls) | Esther & Abi Ofarim |
| Mike Ogletree (drms) | Fiction Factory |
| Baba Oje (spiritual adviser) | Arrested Development |
| Alda Olafsdottir (vcls) | Alda |
| Mike Oldfield (mult-instr) | Mike Oldfield |
| Volkova Yulia Olegovna (vcls) | TaTu |
| Volkova Yulia Olegovna (vcls) | Tatu |
| Patrick Olive (congas) | Hot Chocolate |
| Laudir de Oliveira (pcssn) | Chicago |
| Oliver (vcls) | Oliver |
| David Oliver (vcls) | Point Break |
| Graham Oliver (ld gtr) | Saxon |
| Gwen Oliver (vcls) | Ritchie Family |
| Jamie Oliver (dj) | LostProphets |
| Peter Oliver (vcls, gtr) | New Seekers |
| William 'Bonney' Oliver (bs) | Shane Fenton & The Fentones |
| Stefan Olsdal (bs) | Placebo |
| Jeff Olson (vcls) | Village People |
| Kenny Olson (gtr) | Uncle Kracker |
| Nigel Olsson (drms) | Elton John |
| Nigel Olsson (drms) | Plastic Penny |
| Michie One (vcls) | Louchie Lou & Michie One |
| Michie One [=Michelle Charles] (rap) | Suggs, Louchie Lou & Michie One |
| Yoko Ono (vcls) | & Plastic Ono Band |
| Yoko Ono (vcls) | John Lennon & The Plastic Ono Band |
| Yoko Ono (vcls) | John Lennon & Yoko Ono |
| Yoko Ono (vcls) | John Lennon, Yoko Ono & The Plastic Ono Band |
| Jason Orange (vcls) | Take That |
| Jason Orange (vcls) | Take That & Lulu |
| Walter Orange (vcls, drms) | Commodores |
| Roy Orbison (vcls, gtr) | Roy Orbison |
| William Orbit (prod) | Bass-O-Matic |
| William Orbit (prod) | William Orbit |
| Royal Philharmonic Orchestra (orch) | Andy Williams & The Royal Philharmonic Orchestra |
| Tony Orlando (vcls) | Dawn |
| Tony Orlando (vcls) | Tony Orlando |
| Brian Ormond (vcls) | Idols |
| Benjamin Orr [=Benjamin Orzechowski] (vcls, bs) | Cars |
| Stacie Orrico (vcls) | Stacie Orrico |
| Claudette Ortiz (vcls) | City High & Eve |
| Claudette Ortiz (vcls) | City High |
| Tom Orton | Smart E's |
| Beth Orton (vcls) | Beth Orton |
| Roland Orzabal (gtr, kbds) | Tears For Fears |
| Roland Orzabal (gtr, kbds) | Tears For Fears |
| Steve Osborne (prod) | Grace |
| Steve Osborne (prod) | Perfecto Allstarz |
| Joan Osborne (vcls) | Joan Osborne |
| John 'Ozzy' Osbourne (vcls) | Black Sabbath |
| Kelly Osbourne (vcls) | Kelly Osbourne |
| Ozzy Osbourne (vcls) | Was Not Was |
| Ozzy Osbourne (vcls) | Ozzy Osbourne |
| Diid Osman (bs) | Sleeper |
| Matt Osman (bs) | Suede |
| Donny Osmond (pno) | Osmonds |
| Jay Osmond (drms) | Osmonds |
| Marie Osmond (vcls) | Donny & Marie Osmond |
| Merrill Osmond (bs) | Osmonds |
| Wayne Osmond (gtr) | Osmonds |
| Alan Osmond (gtr) | Osmonds |
| Donny Osmond (vcls) | Donny Osmond |
| Donny Osmond (vcls) | Donny & Marie Osmond |
| Jimmy Osmond (vcls) | Little Jimmy Osmond |
| Marie Osmond (vcls) | Marie Osmond |
| Johnny Otis (kbds, drms) | Johnny Otis Show & Marie Adams |
| Charlie Ottavio (bs) | Animotion |
| John Otto (drms) | Limp Bizkit |
| John Otto (drms) | All Star Tribute |
| Ben Ottwell (vcls, sld gtr) | Gomez |
| John Otway (vcls, gtr) | John Otway |
| DJ Otzi (vcls) | DJ Otzi |
| Denise Van Outen (vcls) | Denise & Johnny |
| Kelly Overett [=Kelly-O] (vcls) | Cappella |
| Nancy Overton (vcls) | Chordettes |
| Owen (gtr) | Catatonia |
| Jean Owen (vcls) | Vernons Girls |
| Mark Owen (vcls) | Take That |
| Mark Owen (vcls) | Take That & Lulu |
| Sarah-Jane Owen (gtr) | Belle Stars |
| Malcolm Owen (vcls) | Ruts |
| Mark Owen (vcls) | Mark Owen |
| Ray Owen (vcls) | Juicy Lucy |
| Reg Owen (orch ldr) | Reg Owen |
| Donnie Owens (gtr) | Duane Eddy & The Rebels |
| Shirley Owens (vcls) | Shirelles |
| Lynn Owsely (pdl stl gtr) | Uncle Kracker |
| Peter Oxendale (kbds) | Sparks |
| DJ Oxide (DJ) | Oxide & Neutrino |
| DJ Oxide [=Alex Rivers] (DJ) | Oxide & Neutrino |
Document created 25 August 2006. Copyright Chartwatch Publications 2000-2006