Esiintyjät (O)
- Octava (1987)
- Odean Pope (1988)
- Odean Pope Saxophone Choir (2002)
- Odean Pope Trio (2002)
- Odetta (1976)
- Oiling Boiling (1972)
- Oiling Boiling (1997)
- Oiling Boiling Blues Band (1989)
- Oiling Boiling R&B Band (1993)
- Oiling Boiling R&B Band (1994)
- Oiling Boiling Ribs & Bones Band (1996)
- Ojos de Brujo (2011)
- Ola Kvernberg Ensemble (2002)
- Ola Kvernberg Trio (2001)
- Olavi trio feat. J.Aaltonen (2012)
- Old Time Jam Session (2011)
- Old Time Jazz Band (1986)
- Old Time Jazz Band (1985)
- Old Time Jazz Band (1984)
- Old Time Jazz Band (1987)
- Old Time Jazz Band (1982)
- Olli Ahvenlahti "The Poet" (2012)
- Olli Ahvenlahti All Stars (1997)
- Olli Ahvenlahti All Stars (1998)
- Olli Ahvenlahti Band (2002)
- Olli Ahvenlahti Band (1999)
- Olli Ahvenlahti Band (2000)
- Olli Ahvenlahti Ensemble (2003)
- Olli Ahvenlahti Ensemble (1982)
- Olli Ahvenlahti Group (2005)
- Olli Ahvenlahti Meditation with Johanna Iivanainen & Eero Koivistoinen (2004)
- Olli Ahvenlahti Quartet (1977)
- Olli Ahvenlahti Quintet (1975)
- Olli Ahvenlahti Trio (1990)
- Olli Ahvenlahti Trio (1996)
- Olli Ahvenlahti Trio (1993)
- Olli Ahvenlahti Trio (1988)
- Olli Ahvenlahti Trio (1992)
- Olli Ahvenlahti Trio (1994)
- Olli Ahvenlahti Trio (1987)
- Olli Ahvenlahti Trio (1995)
- Olli Ahvenlahti Trio (1989)
- Olli Ahvenlahti Trio (1991)
- Olli Ahvenlahti with Johanna Iivanainen & Eero Koivistoinen (2004)
- Olli Ahvenlahti: The Poet (2009)
- Olli Hirvonen Quartet (2011)
- Olli Ojajärvi trio (2010)
- Olli Soikkeli (2011)
- Olli Soikkeli Django Band (2012)
- Olli Soikkeli String Band (2012)
- Olodum (1999)
- Olu Dara (2001)
- Olympia Brass Band (1986)
- Omani Uni: Emma Salokoski & Maria Ylipää (2011)
- Omnibus (2007)
- Ona Kamu (1995)
- One For All (2005)
- One Four All New Orleans Band (2004)
- One Mo´ Time (1984)
- One O´Clock Humph (1993)
- Open Art Band (1991)
- Opening Jam Session (1999)
- Opening Jam Session (2003)
- Opening Jam Session (2000)
- Opening Jam Session (2001)
- Opening Jam Session Group (2003)
- Ophelia Ragtime (2004)
- Opus 5 (1982)
- Oregon (1975)
- The Organ Traders (2007)
- The Original Cab Calloway Cotton Club Revue (1989)
- Original Royal Players Brass Band (2002)
- Orion Brass Band (1996)
- Orion New Orleans Brass Band (1993)
- Ornette Coleman & The Prime Time (1991)
- Ornette Coleman Sextet (1978)
- Oscar D´Leon y Su Orquestra (1996)
- Oscar Peterson (1986)
- Oscar Peterson with Herb Ellis, Ray Brown & Jeff Hamilton (1991)
- Osmo Ikonen (2012)
- Otava Jam Session (2008)
- Otis Rush (1991)
- Oton Kvartetti (1973)
- Otto Donner - Esa Pethman Session 66 (1995)
- Otto Donner Orchestra (1966)
- Otto Donner Treatment (1970)
- Otto Donner Treatment (1969)
- Otto Donner Treatment (1981)
- Otto Donner Treatment (1968)
- Otto Donner Treatment (1967)
- Oulunkylä Big Band (1990)
- Oulunkylä Camp Bands (1988)
- Oulunkylän Leiriorkesterit (1986)
- Oulunkylän Musiikkiopiston Suurorkesteri (1978)