Paul Oakenfold

Philip Oakey

Berry Oakley

John Oates

David Oberlé

Ciarán Ó Braonáin

Tim O'Brien

Fiachna O'Broainain

Alan O'Bryant

Ric Ocasek

Billy Ocean

Lucky Oceans

Colm O'Ciosoig

Eliades Ochoa

Phil Ochs

Chris O'Connell

Maura O'Connell

Charles O'Connor

Mark O'Connor

Sinéad O'Connor

Bill Oddie

Henry Oden

Odetta

Micheál Ó Domhnaill

Joe O'Donnell

Roger O'Donnell

Rosie O'Donnell

Noel Ó Dúgáin

Pádraig Ó Dúgáin

Esther Ofarim

Jamie O'Hara

Mary Margaret O'Hara

Brendan O'Hare

Patrick O'Hearn

Damien O'Kane

Leo O'Kelly

Bragi Olafsson

Babutunde Olatunji

Jamie Oldaker

Mike Oldfield

Molly Oldfield

Sally Oldfield

Terry Oldfield

Spooner Oldham

Will Oldham

Christy O'Leary

Darek Oles

Davy O'List

Graham Oliver

Janis Oliver

Kristine Oliver

Kristina Olsen

Nigel Olsson

Stephen O'Malley

Liam Ó Maonlaí

Michael Omartian

Damian O'Neill

Eoghan O'Neill

John O'Neill

Keith O'Neill

Mike O'Neill

Yoko Ono

Roy Orbison

William Orbit

Cait O'Riordan

Even Ormestad

Margret "Magga" Örnolfsdóttir

Jim O'Rourke

Benjamin Orr

Bobby Orr

Tony Ortega

Beth Orton

Roland Orzabal

Anders Osborne

Joan Osborne

Joe Osborne

Sonny Osborne

Ozzy Osbourne

Paul Oscher

Paul O'Shaughnessy

KT Oslin

Donny Osmond

Michael O'Suilleabhain

Jacquie O'Sullivan

Clyde Otis

Johnny Otis

Shuggie Otis

Peter O'Toole

Steve Overland

Buck Owens

Calvin Owens

Charles Owens

Paul Owens

Tim "Ripper" Owens

Bryan Owings

Adrian Oxaal

Tony Oxley

Monty Oxy-moron

Frank Oz