Composers – O
Composers: O'Baoill - O’Kaine
- O'Baoill, Mánus
- O'Brien, Catherine
- O'Brien, Colin
- O'Brien, Francis Patrick
- O'Brien, John
- O'Brien, Marty
- O'Brien, Michael
- O'Brien, Orin
- O'Brien, Richard
- O'Brien, Spike
- O'Brien, Vincent (1871-1948)
- O'Broin, Eoin
- O'Callanain, Niall
- O'Canainn, Tomas
- O'Carolan, Turlough (1670–1738)
- O'Carroll, Fintan
- O'Cearbhalláin, Toirdhealbhach
- O'Connell, Bridget
- O'Connell, Finneas
- O'Connell, Ryan
- O'Connor-Ballantyne, Katie
- O'Connor-Morris, Geoffrey
- O'Connor, Armel
- O'Connor, Frederick (1870-1943)
- O'Connor, Shamus
- O'Connor, Thomas
- O'Day, Alan
- O'Dell, Roger
- O'Donnell, Brian
- O'Donnell, James
- O'Donnell, Marty
- O'Dorn, Michael
- O'Duffy, Grace
- O'Fallon, David
- O'Farrill, Chico
- O'Flynn, Charles
- O'g, Séan
- O'Gorman, Denis
- O'Gorman, Pete
- O'Gorman, Peter
- O'Halloran, Dustin
- O'Hara, Geoffrey (1882–1967)
- O'Hara, Michael
- O'Hare, Christopher
- O'hearn, Arletta
- O'Hern, Michael
- O'Hogan, Betsy
- O'Keefe, Donald
- O'Keeffe, John
- O'Kelly, Niamh
- O'Kill, John
- O'Loughlin, Sean
- O'Mahony, Gerald
- O'Malley, Howard
- O'Mara, Peter
- O'Meara, Richard
- O'Neal, Barry
- O'Neal, Douglas
- O'Neil, Paul
- O'Neil, Stuart P.
- O'Neill, Jackie
- O'Neill, John
- O'Neill, Nicholas
- O'Neill, Norman
- O'Neill, Paul
- O'Neill, Stuart
- O'Regan, Tarik (b.1978)
- O'Reilly, Conor (b.1967)
- O'Reilly, John
- O'Reilly, Roisin Ann
- O'Reilly, Sally
- O'Shaughnessy, Patrick
- O'Shea, Anna Belle
- O'Sulleabhain, Micheal
- O'Sullivan, Donal
- O'Sullivan, Richard
- O'Toole, Anthony
- O'Toole, Patricia
- O’Brien, Conor J.
- O’Kaine, Rachel Steckler
Composers: Oakeley - Oesterle
- Oakeley, Herbert (1830–1903)
- Oakes, David
- Oakes, Rodney
- Oakey, George
- Oakland, Ben (1907-79)
- Oakley, D. M.
- Oakley, H. S.
- Oare, Michael
- Oberbek, Jan
- Oberborbeck, Felix
- Oberdoerffer, Paul
- Oberdörffer, Fritz
- Oberdörffer, Manfred
- Oberfeld, Camille
- Oberfeld, Casimir
- Oberhoffer, Heinrich
- Oberhoffer, R. W.
- Oberleitner, Andreas (1786-?)
- Obermair, Romana
- Oberson, René
- Oberthur, Carl
- Oberthür, Charles (1819–95)
- Obijalska, Dorota
- Obiltschnig, Andreas
- Obiols, Mariano
- Obouhow, Nicolas
- Obradors, Fernando Jaumandreu (1897–1945)
- Obradovic, Maya Le Roux
- Obradovic, Petar
- Obrecht, Jacob (c.1457–1505)
- Obrovska, Jana
- Obst, Michael (b.1955)
- Obyedov, Yury
- Ocampo, Mauricio Cardozo
- Occa, J.
- Ocha, Pitt
- Ochi, Takashi
- Ochoa, Luis
- Ochoco, Lisa
- Ochs, Bill
- Ochs, Gerd
- Ochs, Günter
- Ochs, Jürgen
- Ochs, Klaus
- Ochs, R.
- Ochs, Siegfried (1858–1929)
- Ochs, Volker
- Ockeghem, Johannes (c.1420–1497)
- Ockelford, Adam
- Ocón, Eduardo (1833–1901)
- Oda, Miyuko
- Odak, Krsto
- Odam, George
- Oddo, John
- Odegaard, Denese D.
- Odegaard, Hendrik
- Odeh-Tamimi, Samir
- Odell, F.
- Odell, Herbert F.
- Oden, Annette
- Odero, Giulio
- Odinga, Henk-Doeke
- Odom, Lawrence T.
- Odori, Sergio
- Odrich, Jim
- Odriozola, Ricardo
- Odstrcil, Karel
- Oechsler, Elias
- Oehl, August
- Oehl, Johannes
- Oehme, Walter
- Oehring, Helmut (b.1961)
- Oelbrandt, Kris
- Oelschlegel, Alfred
- Oepen, Heinz
- Oerle, Dirk van
- Oertzen, Rudolf von
- Oesten, Max
- Oesten, Theodor
- Oesterle, Louis
Composers: Oesterreich - Olivares
- Oesterreich, Margarethe von
- Oestreich, Carl (1800–40)
- Oetiker, August
- Oeye, Helge
- Oeyen, Andrew von
- Ofenbauer, Christian
- Offele, Winfried
- Offenbach, Jacques (1819–80)
- Offerdal, Hans
- Offermann, Thomas
- Offermans, Wil
- Offutt, Fred
- Offvid, Mathisson
- Ogasapian, John
- Ogawa, Takashi
- Ogden, David
- Ogden, Nigel (b.1954)
- Ogermann, Klaus
- Oggionni, Paolo
- Ogikubo, Kazuaki
- Ogilvy, F.
- Ogilvy, Susan
- Ogiński, Michael Kleofas
- Oglesby, Donald
- Oglethorpe, Sheila
- Ogura, Ro
- Ohana, Maurice (1913–92)
- Ohls, Petter
- Ohlschmidt, Jim
- Ohlsen, Oscar
- Ohmae, Satoshi
- Ohse, Reinhard
- Oill, Christopher
- Oines, Sylvia Berg
- Oishi, Shoko
- Ojanen, Eero
- Ojeda, Gabriel Robles
- Okamoto, Shinsuke
- Okasaka, Keika
- Okoye, Nkeiru
- Okpebholo, Shawn E.
- Okpoti, Rebekah
- Okudzawa, Bułat
- Okumura, Hajime
- Okumura, Koh
- Olafsdottir, Hallfridur
- Olah, Tiberiu (1928–2002)
- Olan, David
- Olatunji, Via
- Olavide, Gonzales de
- Olazabal, Tirso
- Olbrisch, Franz Martin (b.1952)
- Olcese, Stefano
- Olcott-Bickford, Vahdah
- Olcott, Chauncey
- Olcott, James L.
- Oldemeyer, Klaus
- Olden, Stefan
- Oldenkamp, Michiel
- Oldham, Arthur William (1926–2003)
- Oldham, Kevin William (1960–93)
- Oldham, Madeline
- Oldroyd, George
- Olds, Solomon
- Olechowski, Józef (b.1959)
- Olejar, Peter Paul
- Oler, Kim
- Olesen, Ole Winstrup
- Olesen, Thomas Agerfeldt (b.1969)
- Oley, Johann Christoph (1738–89)
- Olias, Lothar
- Olien, Raymond
- Oligario, Diaz
- Olioso, Dolores
- Oliphant, Thomas
- Oliva, A.
- Oliva, Julio César
- Olivadoti, Joseph
- Olivares, Carlos A.
- Olivares, Clara
Composers: Olivares - Oltrasi
- Olivares, Violant
- Olive, Leslie
- Olive, Vivienne
- Oliveira Pinto, Tiago de
- Oliveira, Jamary
- Oliveira, Sergio Roberto de
- Oliver, Ángel
- Oliver, Christian 'Ceej'
- Oliver, Curt
- Oliver, Gary
- Oliver, Harold
- Oliver, Herbert
- Oliver, Janie
- Oliver, Jay
- Oliver, Julian
- Oliver, Nancy
- Oliver, Richard
- Oliver, Rick
- Oliver, Stephen (1950–92)
- Oliver, Sy
- Olivera, Hector
- Olivero, Betty (b.1954)
- Olivier, Antje
- Olivier, François
- Olivier, Philippe
- Olivieri, Alessio
- Olivieri, Dino (1905–63)
- Oliviero-Denaës, Amélie
- Oliviero, Nino
- Olivisi, Leïla
- Olizeg, Renate
- Ollendorff, Tom
- Oller, Gabriel
- Oller, Teresa
- Ollerenshaw, T. R.
- Ollila, Iiro
- Ollila, S.
- Ollivier, James
- Ollone, Max d' (1875–1959)
- Olm, Marcel
- Olman, Abe
- Olman, Israel J.
- Olmo, Alberto
- Olmos, Rafael Grimal
- Olmstead, Neil
- Olof, T.
- Olorenshaw, Thomas
- Olrik, Janne
- Olroyd, George
- Olsen, Alice
- Olsen, Bent
- Olsen, Bjarne
- Olsen, Carl
- Olsen, Gustav Sparre
- Olsen, J.P.
- Olsen, Kevin
- Olsen, Kurt Elley
- Olsen, Lynn Freeman
- Olsen, Martin Spang
- Olsen, Ole (1850–1927)
- Olsen, Poul Rovsing (1922–82)
- Olsen, Ursula A.
- Olshanetsky, Alexander (1891–1946)
- Olson, Brian M.
- Olson, Julia
- Olson, Kevin (b.1970)
- Olson, Nate
- Olson, Robert
- Olson, Tawnie
- Olsson, Birgitta Holst
- Olsson, Milton
- Olsson, Otto Emanuel (1879–1964)
- Olst, Gerard Rijken van
- Olstad, Brent
- Olsvai, I.
- Olszamowski, Sławomir
- Olthof, André
- Olthuis, T.
- Oltmann, Uwe
- Oltrasi, Giuseppe
Composers: Olusola - Orem
- Olusola, Kevin
- Olvera, John
- Omar, Don
- Ombredane, Olivier
- Omelchuk, Oxana
- Omiccioli, Nick
- Omizzolo, Silvio
- Ommen, D. van
- Ompteda, F.
- Ondrasik, John
- Ondricek, Emanuel
- Ondříček, František
- Ondrus, Ján
- Onen, Denise L.L.
- Ongarello, Antonio
- Onieva, Asunción
- Onorati, Henry
- Onorati, Stefano
- Onorato, Antonio
- Onovwerosuoke, Fred
- Onslow, George
- Onyeji, Christian
- Oomen, Antoine
- Oomes, P. J.
- Oortmerssen, J.
- Oost, Arthur van
- Oost, Gerd
- Oosten, R. Van
- Oostenbrink, Vincent
- Oostenbroek, Neridah
- Oosterhout, Arjen
- Oosterhuis, T.
- Oosthuizen, Amanda
- Oostveen, K. van
- Opalski, Józef
- Opazo Muñoz, Mauricio
- Openshaw, John
- Opgenoorth, Norbert
- Ophee, Matanya
- Ophoven, Hermann
- Opie, Duncan
- Opitz, Bernhard
- Opitz, E.
- Oppelt, Robert
- Oppenheim Schreiner, Elissa
- Oppenheim, Tony
- Oppenheimer, David
- Oppenheimer, James
- Oppenheimer, Jehuda
- Opperman, Kalmen
- Oppo, Franco
- Oprandi, Philippe
- Opsahl, Josephine
- Oquin, Wayne (b.1977)
- Oradini, Giovan Battista
- Orador, François de
- Oranje, Willem
- Orazi, Claudio
- Orbán, György (b.1947)
- Orban, Marcel
- Orbech, Georges
- Orbon, Julian
- Orchard, William Arundel
- Orcino, Leonard.A
- Ord-Hume, Ian
- Ord, Boris (1897-1961)
- Ordaz, Jessica Lynne
- Ordaz, Matthew
- Ordoñez, Carlos d'
- Ore, Cecilie
- Ore, Charles W.
- Ore, Harry
- Orechovsky, Stanislav
- Orefice, Enzo
- Orefice, Giacomo
- Orefici, Alberto
- Orekhov, Sergei (1935-98)
- Orelio, Mauro
- Orem, Philip
- Orem, Preston W.
Composers: Orenstein - Ortona
- Orenstein, Arbie
- Orenstein, Pete
- Orff, Carl (1895–1982)
- Orff, Gertrud
- Orgad, Ben-Zion
- Organ, Anne Krentz
- Oribe, Jose
- Orielso, Jesús
- Orimo, Manabu
- Oriol, Emmanuel
- Orita, Eiko
- Orkin, Evgeni
- Orkisz, Andrzej
- Orlandi, Paolo
- Orlandini, Giuseppe Maria
- Orlando, M. Chiara
- Orlando, Morgan R.
- Orlando, Salvatore
- Orledge, Robert
- Orling, Hans G.
- Orloff-Tschekorsky, Tatjana
- Orloff, Vladimir
- Orlowsky, David
- Ormay, Imre
- Orme, Jeanine
- Ornadel, Cyril
- Ornstein, Leo
- Oro, Xabier
- Oromszegi, Otto
- Orozco, Felipe
- Orozco, Jorge
- Orphee, Matanya
- Orr, Buxton (1924–97)
- Orr, Charles Wilfred (1893–1976)
- Orr, J.
- Orr, Robin (1909–2006)
- Orr, Shimrit
- Orrego-Salas, Juan Antonio (1919–2019)
- Orrell, Sue
- Orrey, L.
- Orselli, Luigi (d.1878)
- Orshan, Allen
- Orsi, Andrea
- Orsi, Celestino
- Orsi, Romeo
- Orsini, Vincent
- Orso, Dario Antonio
- Orsolino, F.
- Orsouiw, C. van
- Orsouw, Coen van
- Orta, Michael
- Ortega Blanco, Jose Antonio
- Ortega, Palito
- Ortelli, Toni
- Orth, Charles J.
- Orth, John
- Orthaus, Burkhard
- Orthel, Léon (1905–85)
- Ortiz De Villajos, Angel
- Ortiz, Alberto Rodriguez
- Ortiz, Alfredo Rolando
- Ortiz, Diego (1510–70)
- Ortiz, Joe and Pauly
- Ortiz, Pauly
- Ortiz, Ray
- Ortiz, Suzzette
- Ortiz, William
- Ortize, Brian
- Ortleb, Willy
- Ortmans, René (1863-1949)
- Ortmeier, Philipp
- Ortmueller, Ernst
- Ortner, Anton
- Ortner, Jakob
- Orto, Marbrianus de (1460–1529)
- Ortolani, Angelo
- Ortolani, Riz
- Ortolina, Carlo
- Orton, Richard (1940-2013)
- Ortona, Aedvardus de
Composers: Ortuso - Othmayr
- Ortuso, Michele
- Orval, Francis
- Orval, Jules
- Ory, Isabelle
- Orzabal, Roland
- Orzechowski, Jerzy
- Osbon, David
- Osborn, Sean
- Osborne, Charles
- Osborne, Chester G.
- Osborne, E.
- Osborne, G. A.
- Osborne, Leslie
- Osborne, Nigel (b.1948)
- Osborne, Reginald
- Osborne, Tony
- Osborne, Willson
- Oschatz, Ruth
- Oscheit, Max
- Oscher, Efrain
- Osentowski, Francis
- Oser, Hans
- Oser, Stefan (b.1965)
- Osgood, Charles
- Osgood, Clive
- Osgood, Donald
- Oshrat, Kobi
- Osiander, Irene
- Osiander, Lucas
- Osieck, Hans
- Osiecka, Agnieszka
- Osinchuk, J.
- Oskam, Victor
- Oskar Gottlieb, Oskar Gottlieb (b.1934)
- Osma, Julio de
- Osman, Terry
- Osmon, Leroy
- Osmond, Cuthbert E
- Osmond, Harold B
- Osmond, Marcella
- Osorio Swaab, Reine Colaco
- Ospald, Klaus (b.1956)
- Osppe, Eryk Brikner
- Osse, Klaus
- Osser, Glenn
- Ossewaarde, J. H.
- Ossola, Bruno
- Ossowski, Stanisław
- Ostadalova, Zdenka
- Ostalczyk, Z.
- Ostendorf, Jens-Peter (1944–2006)
- Oster, Louis
- Osterc, Slavco
- Ostergren, Eduardo
- Osterling, Eric
- Ostermann, Willi
- Osterwald, Hazy
- Osthoff, Andrea
- Osti, Patrizia
- Ostleitner, Elena
- Ostling, Acton
- Ostling, Eric
- Ostrander, Allen
- Ostransky, Leroy
- Ostrčil, Otakar (1879–1935)
- Ostrom, Magnus
- Ostroushko, Peter
- Ostrzyga, Michael
- Oswald, Albert H.
- Oswald, Gerald
- Oswald, H.
- Oswald, Henrique
- Oswald, James (1710–95)
- Oswald, Julian
- Oswald, René
- Otaka, A.
- Otaka, Tadaaki
- Otano, Nemesio
- Othegraven, August von
- Othmayr, Caspar
Composers: Otmar - Owen
- Otmar, Macha
- Otsu, Yumi
- Ott, Daniel
- Ott, David
- Ott, Eugen
- Ott, Johann
- Ott, Rezső
- Ott, Thomas
- Ottaiano, Luigi
- Ottaviani, Angelo
- Ottaway, Hugh
- Otte, E.
- Otte, Hans (1926–2007)
- Otten, Kees
- Otterloo, Thijs van
- Otterloo, Willem van
- Ottesen, Janove
- Ottewell, Linda
- Ottley, Matt
- Ottman, John (b.1964)
- Ottner, M.
- Otto, Donna
- Otto, Franz
- Otto, Hildebrand
- Otto, Julius
- Otto, Kay Michael
- Otto, Luigi (c.1750-?)
- Otto, Tanner
- Otto, Uli
- Otto, Uwe
- Otto, Valerius (1579-1612)
- Ottomano, Vincenzina C.
- Ottschofski, Marcus
- Ouali, Farid
- Oubradous, Fernand
- Ouchterlony, David
- Ouderits, Leo
- Oudrid, Cristobal
- Ouellet, Gilles
- Ouellete, Antoine
- Ould, Samuel Gregory
- Oullie-Krausse, Pierrette
- Ourgandjian, Raffi
- Ourkouzounov, Atanas (b.1970)
- Ouseley, Frederick Arthur Gore
- Oushoorn, J. H.
- Ouspenski, Vladislav
- Oussoren, H. L.
- Ouvry-Johns, Christopher
- Ouzonoff, Alexandre
- Ouzounoff, Alexandre
- Ouzounoff, Daniel
- Ovalle, Jayme
- Overby, Rolf
- Overduin, Jan
- Overeem, Mario van
- Overgard, Hans
- Overheidt, von
- Overholt, Miriam
- Overholt, Ray
- Overland, Corin T.
- Overstreet, Benton
- Overstreet, Paul
- Overthrow, David
- Overton, Hall
- Ovokaitys, Cindy
- Owen Edwards, John
- Owen, A.
- Owen, Alan
- Owen, Alexander
- Owen, Angela M.
- Owen, Blythe
- Owen, D.
- Owen, Harold
- Owen, Idloes
- Owen, J.
- Owen, Jerry M
- Owen, Liz
- Owen, Morfydd
- Owen, Randy
Composers: Owen - Ozzahr
- Owen, Reg
- Owen, Steve
- Owen, Teodora
- Owen, William (1814-93)
- Owenby, Chris
- Owens, Harry
- Owens, Jack
- Owens, James T.
- Owens, Jimmy
- Owens, Matthew (b.1971)
- Owens, Rebecca
- Owens, Robert
- Owens, Sam Batt
- Owens, Terry
- Owens, Terry Winter
- Owens, William
- Owenson, Andrew
- Owolabi, Kola
- Owsinski, Bobby
- Oxa, Anna
- Oxenford, John
- Oxenham, John
- Oxley, Harrison (1933-2009)
- Oxtoby, Charles
- Oyens, Gerrit de Marez
- Ozaki, Kazunari
- Ozawa, Hisato
- Ozeki, Tamihiro
- Ozi, Etienne (1754-1813)
- Ozzahr, Noureddine
