| Type | Cover | Title  | Date | Source | ||
| Audio |  |
O Corcunda de Notre Dame (The Hunchback Of Notre Dame) | 1996 | Brazilian Soundtrack | ||
| Audio |  |
O Fantasma Da Opera (The Phantom Of The Opera) | 2005 | Studio Cast | ||
| Audio |  |
O Marry Me! | 1961 | Original Off-Broadway Cast | ||
| Audio |  |
O Rei Leão (The Lion King) | 1994 | Portuguese Soundtrack | ||
| Audio |  |
O say can you see! | 1962 | Original Off-Broadway Cast | ||
| Audio |  |
O Βασιλιάς των Λιονταριών (The Lion King) | 1994 | Greek Soundtrack | ||
| Audio |  |
O. T. | 2000 | Washington, D.C. Cast | ||
| Audio |  |
O.K? (Rock Follies Of 77) | 1977 | Soundtrack | ||
| Audio |  |
Ocho Rios (De La Noche: The True Story) | 1986 | Concept Recording | ||
| Audio |  |
The Odd Potato | 2005 | Studio Cast | ||
| Noncommercial Audio |  |
The Odyssey (Home Sweet Homer) | 1975 | Pre-Broadway Cast | ||
| Audio |  |
Oebele! | 2006 | Original Dutch Cast | ||
| Audio |  |
Oedipus, Schmeipus (Oedipus, Shmedipus, As Long As You Love Your Mother) | N/A | Demo | ||
| Audio |  |
Of Pleasures There Are Many (Utopia Limited) | 1963 | Studio Cast | ||
| Audio |  |
Of Thee I Sing | 1952 | Broadway Cast | ||
| Audio |  |
Of Thee I Sing | 1972 | Television Cast | ||
| Audio |  |
Of Thee I Sing | 1987 | Studio Cast | ||
| Audio |  |
Off Broadway |  | 1963 | Jerry Orbach | |
| Audio |  |
Off the Wall | 1991 | London Concept Album | ||
| Audio |  |
Oh Captain! | N/A | Bob Prince Quintet | ||
| Audio |  |
Oh Captain! | 1958 | Studio Jazz with Vocals | ||
| Audio |  |
Oh Captain! | 1958 | Stan Freeman Jazz Quartet | ||
| Audio |  |
Oh Captain! | 1958 | Studio Cast | ||
| Audio |  |
Oh Captain! | | 1958 | Original Cast members | |
| Audio |  |
Oh My Godmother!: A Fabulous Fairy Tale | 2008 | San Francisco Cast | ||
| Audio |  |
Oh Perilous World | 2007 | Studio Cast | ||
| Audio |  |
Oh Qué Gran Circo (Evita) | 1980 | Original Madrid Cast | ||
| Audio |  |
Oh What a Circus (Evita) | 1979 | David Essex | ||
| Audio |  |
Oh What a Memory We Made... Tonight | 1983 | Peggy King | ||
| Audio |  |
Oh! Calcutta! | 1969 | Original Broadway Cast | ||
| Audio |  |
Oh! Calcutta! | 1970 | Australian Cast | ||
| Video |  |
Oh! Calcutta! | 1971 | Film Cast | ||
| Audio |  |
Oh! Calcutta! | 1971 | Original Dutch Cast | ||
| Audio |  |
Oh! Calcutta! | 2000 | Italian cast | ||
| Video |  |
Oh! Calcutta! | 2001 | Italian Cast | ||
| Audio |  |
Oh! What a Lovely War | 1963 | Original London Cast | ||
| Video |  |
Oh! What a Lovely War | 1969 | Film | ||
| Audio |  |
Oh! What a Lovely War | 1969 | Film Soundtrack | ||
| Audio |  |
Oh, Boy! | 2005 | Comic Opera Guild | ||
| Audio |  |
Oh, Brother! | 1981 | Original Broadway Cast | ||
| Audio |  |
Oh, Coward! | 1972 | Original Off-Broadway Cast | ||
| Audio |  |
Oh, Diahne! | 1997 | Concept Album | ||
| Audio |  |
Oh, Johnny | 1997 | Dutch Cast | ||
| Audio |  |
Oh, Kay! | 1926 | Archival reconstruction of original 1924 production | ||
| Audio | |
Oh, Kay! | 1927 | Original London Cast | ||
| Audio |  |
Oh, Kay! | | 1955 | Studio Cast | |
| Audio |  |
Oh, Kay! | 1960 | Revival Cast | ||
| Audio |  |
Oh, Kay! | 1994 | Studio Cast | ||
| Audio |  |
Oh, Lady Be Good! Best of the Gershwin Songbook | | 1959 | Ella Fitzgerald | |
| Audio |  |
Oh, Lady Be Good! Best of the Gershwin Songbook | | 1959 | Ella Fitzgerald |