| Orphan Fairytale | 1 | 2012 |
| Orphans In The City | 1 | 1984 |
| Orphei Drängar Och Eric Ericson | 2 | 1977 - 1984 |
| Orpheus | 8 | 1968 - 1971 |
| Orpheus [Yugoslavia] | 1 | 1978 |
| Orquesta Akokán Canta: José "Pepito" Gómez | 1 | 2018 |
| Orquesta America | 1 | |
| Orquesta Antonio Maria Romeu | 1 | 1961 |
| Orquesta Aragon | 5 | 1956 - 1978 |
| Orquesta Broadway | 1 | 1975 |
| Orquesta Dee Jay | 1 | 1970 |
| Orquesta Del Concertgebouw De Amsterdam, Ingrid Haebler, Elly Ameling, Dalton Baldwin | 1 | 1981 |
| Orquesta Espanola De Baile | 1 | 1970 |
| Orquesta Fiesta Cubana | 1 | 1957 |
| Orquesta Filarmónica De Espana | 1 | 1971 |
| Orquesta Filarmónica De Viena | 1 | 1990 |
| Orquesta Frank Hernandez | 1 | 1966 |
| Orquesta Luz Eléctrica | 1 | 1976 |
| Orquesta Montilla | 1 | 1957 |
| Orquesta Nacional De España | 1 | 1976 |
| Orquesta Nacional De España, Ataulfo Argenta | 1 | 1958 |
| Orquesta Novel | 1 | 1989 |
| Orquesta Philharmonia Dir. Sir Malcolm Sargent | 1 | 1969 |
| Orquesta Popular De Madrid De La Organizacion Nacional De Ciegos, Rafael Rodriguez Albert | 1 | 1958 |
| Orquesta Rio Plata | 1 | 1972 |
| Orquesta Riverside | 1 | |
| Orquesta Romántica Del Casino De Hawana | 1 | 1983 |
| Orquesta Sinfonica Del S.O.D.R.E. | 1 | |
| Orquesta Sinfonica Espanola | 1 | 1971 |
| Orquesta Soul | 1 | 1967 |
| Orquesta Sublime | 1 | 1961 |
| Orquesta Tipica Española | 1 | 1967 |
| Orquestra De Pereira Dos Santos E Coro Popular De Samuel Rosemberg | 1 | |
| Orquesta Del Concertgebouw De Amsterdam | 2 | 1981 - 1985 |
| Orquestra E Coro CID | 1 | 1977 |
| Orquestra Milionários Del Rio | 1 | 1965 |
| Orquestra RCA Victor | 1 | 1955 |
| Orquestra Românticos De Cuba | 4 | |
| Orquestra Serenata Tropical | 2 | 1973 |
| Orrin Star | 2 | 1982 - 1988 |
| Orritons | 1 | 1978 |
| Orsa Lia | 1 | 1979 |
| Orson Bean | 2 | 1959 - 1969 |
| Orson Bean, Barbara Minkus, Bill Hinnant, Clark Gesner With The MGM Orchestra | 1 | 1976 |
| The Orson Family | 2 | 1983 - 1985 |
| Orson Welles | 8 | 1968 - 1978 |
| Orup | 2 | 1988 - 1989 |
| Orval Prophet | 1 | |
| Orville Couch | 1 | 1964 |
| Orville Nash With Mitch And Frank | 1 | 1990 |
| Orville Stoeber | 1 | 1971 |
| The Orwells | 1 | 2016 |
| Osage | 2 | 1980 - 1981 |
| Osage Tribe | 1 | 2004 |
| Osamu | 1 | 1987 |
| Osamu Kitajima | 3 | 1977 - 1987 |
| Osanna | 10 | 1974 - 2018 |
| Osanna And David Jackson | 1 | 2009 |
| Oscar Peterson Trio + One, Clark Terry | 2 | 1964 |
| Osborne Brothers | 3 | 1973 |
| The Osborne Brothers / Lonzo And Oscar | 1 | 1964 |
| The Osborne Brothers And Red Allen | 2 | 1959 |
| The Osborne Brothers | 23 | 1959 - 1978 |
| Osborne Smith | 1 | 1960 |
| Oscar | 3 | 1974 - 1976 |
| Oscar "Papa" Celestin | 4 | 1960 - 1962 |
| Oscar "Papa" Celestin And His Tuxedo Jazz Band | 1 | |
| Oscar Alemán | 1 | |
| Oscar Benton | 8 | 1968 - 1982 |
| Oscar Benton And His Band | 1 | 1972 |
| Oscar Benton Blues Band | 5 | 1968 - 1982 |
| Oscar Brand | 42 | 1955 - 1980 |
| Oscar Brand And His Backroom Boys | 1 | 1966 |
| Oscar Brand And The Secret Band | 1 | 1980 |
| Oscar Brand And The Short Arms | 2 | 1963 |
| Oscar Brand And The Ski Bums | 1 | 1962 |
| Oscar Brand With The Roger Wilco Four | 2 | 1959 - 1960 |
| Oscar Brand With The Tarriers | 1 | 1962 |
| Oscar Brown, Jr. | 16 | 1960 - 2017 |
| Oscar Brown, Jr. And Luis Henrique | 1 | 1966 |
| Oscar Clinton And His Orchestra | 3 | |
| Oscar D'Leon | 1 | 1982 |
| Oscar Grasso (Violin), Marie Goossens (Harp), With The Serenade Orchestra | 1 | 1963 |
| Oscar Harris | 4 | 1970 - 1980 |
| Oscar Harris And Billy Jones And The Twinkle Stars | 1 | 1972 |
| Oscar Harris And The Twinkle Stars | 2 | 1970 - 1972 |
| Oscar Klein | 1 | 1970 |
| Oscar Levant | 3 | 1955 |
| Oscar Levant, The Philadelphia Orchestra, Eugene Ormandy | 1 | 1948 |
| Oscar McLollie And His Honey Jumpers | 1 | 1981 |
| Oscar Moore Quartet | 1 | 1985 |
| Oscar Perry | 1 | 1978 |
| Oscar Peterson | 115 | 1950 - 2018 |
| Oscar Peterson + One, Clark Terry | 1 | |
| Oscar Peterson - Clark Terry | 1 | 1976 |
| Oscar Peterson - Stephane Grappelli Quartet | 1 | 1973 |
| Oscar Peterson And Clark Terry | 1 | 1975 |
| Oscar Peterson And Count Basie | 3 | 1975 - 1986 |
| Oscar Peterson And Dizzy Gillespie | 1 | 1975 |
| Oscar Peterson And Harry Edison | 1 | 1975 |
| Oscar Peterson And Joe Pass | 1 | 1975 |
| Oscar Peterson And Nelson Riddle | 1 | |
| Oscar Peterson And Roy Eldridge | 1 | 1975 |
| The Oscar Peterson Big 6 | 2 | 1975 |
| Oscar Peterson Quartet | 1 | |
| The Oscar Peterson Quartet | 4 | 1955 - 1974 |
| Oscar Peterson Trio | 2 | 1962 - 1980 |
| The Oscar Peterson Trio And Orchestra | 1 | 1975 |
| The Oscar Peterson Trio And The Singers Unlimited | 2 | 1973 |
| Oscar Peterson Trio With Herb Ellis | 1 | 1972 |
| The Oscar Peterson Trio With Herb Ellis | 3 | 1972 - 1973 |
| Oscar Peterson Trio With Milt Jackson | 2 | 1980 |
| The Oscar Peterson Trio | 34 | 1954 - 2018 |
| Oscar Peterson With Trio And Orchestra | 1 | 1957 |
| Oscar Peterson, Milt Jackson, Ray Brown, Louis Hayes | 1 | |
| Oscar Peterson, N. H. Orsted-Pedersen, Louis Hayes | 1 | 1974 |
| Oscar Peterson, Ray Brown, Ed Thigpen | 1 | 2014 |
| Oscar Pettiford | 5 | 1970 - 2000 |
| The Oscar Pettiford Orchestra | 1 | 1984 |
| Oscar Rabin And His Band | 1 | 1981 |
| Oscar Shumsky, Violinist | 1 | 1959 |
| Oscar Toney Jr. | 6 | 1967 - 1988 |
| The Oscar Volk Orchestra | 1 | 1971 |
| Oscar Wilde | 2 | 1965 - 1975 |
| Ose | 1 | 1978 |
| Oshkosh High School A Cappella Choir | 1 | |
| Osibisa | 41 | 1971 - 1981 |
| The Osipov Balalaika Orchestra | 2 | 1971 - 1977 |
| Osipov State Russian Folk Orchestra | 2 | 1970 |
| Osiris | 1 | 1979 |
| Osjan | 1 | |
| Oskar Merikanto | 1 | 1981 |
| Oskar Nedbal | 1 | 1976 |
| Oskar Werner | 1 | 1967 |
| Oskorri | 3 | 1979 - 1984 |
| The Oslo Philharmonic Orchestra, Odd Grüner-Hegge | 1 | |
| Oslo Philharmonic Orchestra, Øivin Fjeldstad | 1 | |
| Osmi Putnik | 1 | 1986 |
| Osmond Boys | 1 | 1990 |
| The Osmond Brothers | 10 | 1963 - 1984 |
| The Osmond Family | 1 | 1972 |
| Osmonds | 8 | 1971 - 1979 |
| The Osmonds | 49 | 1971 - 1979 |
| Osmosis | 1 | 1970 |
| Ossi Ahlapuro, Reino Bäckman | 1 | 1972 |
| Ossian | 6 | 1977 - 1986 |
| Ossian [Poland] | 3 | 1975 - 1980 |
| Ossie Davis | 2 | 1969 - 1972 |
| Ossie Davis And Bill Cosby | 1 | 1972 |
| Ossie Layne Show | 1 | 1969 |
| Ossie Scott | 2 | 1979 |
| Ostbahn-Kurti And Die Chefpartie | 2 | 1985 - 1989 |
| Östen Warnerbring | 21 | 1965 - 1986 |
| Östen Warnerbring, Ernst-Hugo Järegård Och Cornelis Vreeswijk | 1 | 1974 |
| Osvald Helmuth | 2 | 1964 - 1965 |
| Osvaldo Pugliese Y Su Orquesta Típica | 1 | |
| Oswald Jacoby | 1 | 1960 |
| Otéas De Tahiti | 1 | 1975 |
| Otger Dice | 1 | 1977 |
| The Other Half [Pennsylvania] | 1 | 1966 |
| The Other Half | 3 | 1968 - 2004 |
| The Other Ones | 2 | 1986 - 1988 |
| The Other Ray Charles | 1 | 1968 |
| The Others Aka 22PP | 1 | 2006 |
| Otis Ball | 1 | 1989 |
| Otis Blackwell | 2 | 1977 - 1981 |
| Otis Clay | 5 | 1972 - 2013 |
| Otis Redding | 123 | 1964 - 2022 |
| Otis Redding / The Jimi Hendrix Experience | 1 | |
| Otis Redding And Carla Thomas | 5 | 1967 - 2017 |
| Otis Redding And Little Joe Curtis | 5 | 1968 - 1970 |
| Otis Redding With Booker T. And The MG's And The Mar-Keys | 1 | 2019 |
| Otis Redding · King Curtis | 1 | 1968 |
| Otis Rush | 16 | 1969 - 1988 |
| Otis Rush And Magic Sam | 1 | 1980 |
| Otis Spann | 35 | 1961 - 1990 |
| Otis Spann With Fleetwood Mac | 2 | 1969 - 1970 |
| Otis Waygood Blues Band | 1 | 1970 |
| Otis Williams | 5 | 1971 - 1988 |
| Otis Williams And His Charms | 3 | 1978 - 1988 |
| Otis Wright | 1 | 1969 |
| Oto Pestner | 9 | 1973 - 1988 |
| Oto Pestner In Nace Junkar | 1 | 1986 |
| Otoboke Beaver | 1 | 2019 |
| Otroški Zbor Glasbene Šole Franca Šturma, Otroški Zbor RTV Ljubljana, Zbor Cicibanov RTV Ljubljana, Ansambel B. Lesjaka | 1 | 1973 |
| Otta | 1 | 2021 |
| Ottar Johansen | 1 | 1978 |
| The Ottawa Welsh Choral Society | 1 | |
| Ottawan | 8 | 1980 - 1982 |
| Ottie Khan And His Dance Band | 1 | |
| Ottilie Patterson | 15 | 1955 - 2023 |
| Ottilie Patterson With Chris Barber | 1 | 1984 |
| Otto | 35 | 1972 - 1989 |
| Otto Bredl Und Jiggs Whigham | 1 | 1969 |
| Otto Cesana And His Orchestra | 2 | 1952 - 1953 |
| Otto Englisch | 1 | 1969 |
| Otto Hiller, Seine Bordkapelle Und Die Reeperbahn-Dixies | 1 | |
| Otto Hænning | 1 | |
| Otto Klemperer | 2 | 1969 |
| Otto Klemperer Conducting The Philharmonia Orchestra | 1 | |