- O Samuli A
- Octopus Syng [Official]
- Oddarrang
- The Odorants [Official]
- Office of the Dead
- Pentti Rasinkangas ja Ohilyönti [Official]
- Oikosulku [Official]
- Oiva
- Aleksi Ojala [Official]
- Olga [Official]
- Old Spice
- Oliver [Official]
- One Eye Shut [Official]
- One Good Woman
- One Morning Left
- The Ones
- One O´clock Humph
- One Way Out
- OpuNui
- The Orders
- Jukka Orma
- Orquesta Tipica [@ UJO/Hiljaiset Levyt]
- Osmo's Cosmos -70's Rock'n'Roll show ja -band
- O.S.S.Y.
- Outro Lugar [Official]
- Antero Raimo & Ovet [Official]
- Override [Official]
- Cris Owen
- Paul Oxley [Official]
- Oy Ab