| O Círculo de Quases | — | 2010 | Album |
| O melhor de | — | — | Album |
| O Melhor De 2 | — | 2002 | Album |
| O melhor de Zizi Possi: Pedaço de Mim | — | 2. März 1998 | Album |
| O Quarto de Anaquim | — | 1. November 2018 | Album |
| O queridinho de Deus | — | 5. Juli 2024 | Album |
| O zi de primăvară | — | Februar 2006 | Album |
| O.B. McClinton Country | — | 1972 | Album |
| October Country | — | 7. März 2025 | Album |
| October Country | — | 1968 | Album |
| Ohrwürmer: Country Hits | — | 2006 | Album |
| Oklahoma Country Life | — | 19. August 2025 | Album |
| Oktober Country | — | 2001 | Album |
| Old Californio Country | — | 18. November 2022 | Album |
| Old Country | — | 23. August 2019 | Album |
| Old Country | — | 8. Februar 2019 | Album |
| Old Country | — | 19. April 2005 | Album |
| Old Country | — | — | Album |
| Old Country Church | — | 25. März 2022 | Album |
| Old Country Church | — | 1981 | Album |
| Old Country Church | — | 1972 | Album |
| Old Country Hits | — | 15. November 2019 | Album |
| Old Country Mates | — | 2005 | Album |
| Old Country Music | — | 28. Februar 2020 | Album |
| Old Country Pickin's | — | 18. Dezember 2025 | Album |
| Old Country Road | — | 1995 | Album |
| Old Country Song | — | 9. Juni 2017 | Album |
| Old Country Store | — | 21. September 2018 | Album |
| Old Country Town | — | 24. Jänner 1994 | Album |
| Old Timey Country | — | 1. November 2001 | Album |
| Ole Country Boy | — | 10. Dezember 2021 | Album |
| Ole Tyme Country Music | — | September 1970 | Album |
| Olhar de Xamã | — | 1. Februar 2022 | Album |
| Olhos de Quem Ama | — | 1998 | Album |
| Omega Country | — | 2017 | Album |
| On fait du country | — | 26. April 2019 | Album |
| Only Country 1950-1954 | — | 1995 | Album |
| Only Country 1965-1969 | — | 1995 | Album |
| Only Country 1970-1974 | — | 1995 | Album |
| Only Country 1975-1979 | — | 1995 | Album |
| Only Country 1980-1984 | — | 19. Dezember 1995 | Album |
| Only Country 1985-1989 | — | — | Album |
| Only Country: 1960-1964 | — | 1995 | Album |
| Op de planken (25 jaar De Kast) | — | 2015 | Album |
| Op De Zeeweg | — | 10. Mai 2024 | Album |
| Open Country | — | 7. April 2023 | Album |
| OPEN COUNTRY | Tôle-Ache | 18. Februar 2023 | Album |
| Open Country | — | 2014 | Album |
| Open Country | — | 2003 | Album |
| Opus de Funk | — | 2002 | Album |
| Oratorios du Couronnement de Charles X | — | 1993 | Album |
| Orchestre de poussière | — | 23. September 2021 | Album |
| Ordinea De Zi | — | 1984 | Album |
| Original British Country | — | 1998 | Album |
| Orquestra de cordas dedilhadas de Pernambuco | — | 1984 | Album |
| Ortus de Polonia | — | Jänner 2015 | Album |
| OS SAXOFÓNS DE OCCIDENTE | — | 3. März 2024 | Album |
| Osnabruck, DE 22/04/2020 | — | 22. April 2020 | Album |
| Our Brand of Country | — | 1984 | Album |
| Our Country | — | 26. März 2021 | Album |
| Our Country | — | 10. Mai 2012 | Album |
| Our Country | — | 2000 | Album |
| Our Country World | — | 1968 | Album |
| Our Kind of Country | — | 2001 | Album |
| Our Kind of Country | — | 1966 | Album |
| Out Beyond the River: The Compulsion Years Anthology | — | 25. September 2020 | Album |
| Outlaw Country | — | 7. April 2015 | Album |
| Outlaw Country | — | 31. März 2008 | Album |
| Outlaw Country Christmas | — | 19. November 2014 | Album |
| Outoppie Country Hits | — | 2006 | Album |
| Owner Fe De Yard | — | 1994 | Album |
| Ôans bin de Zeeuwen | — | 1993 | Album |