- Oswego Jazz Project
- Oswin Chin Behilia
- OSY
- Osylver Beat Man
- Osylver Project
- Osymyso
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- Öszibarack
- Oszillator5
- Oszkár Maleczky
- Oszkar Maleczky
- Oszkar Okros
- OT
- OT 2006
- OT 2008
- O.T. and The Swingstuff Inc.
- O.T. And Young Jay
- Ot Azoj
- Ot Azoj Klezmerband
- Ot Azoy Klezmerband
- O.T. Coffin
- Ot Danum
- O.T. Quartet
- Ot. To 777
- O.T. Zehn
- O.T.A.
- Ota Petřina
- Otacilio
- Otacilio Melgaço
- O'taïm
- Otakar Kraus
- Otakar Novacek
- OTAKHEE
- 大瀧詠一
- Otaku
- OtaMedia Presents
- 大溪晏弘
- Otar
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- Otavio Augusto/Gabriel
- Otavio E Eliete
- OTB
- OTB
- O.T.B.
- O.T.C
- Otchenga Zoom
- Otecko
- Oteil and the Peacemakers
- Oteil Burbridge
- Oteil & the Peacemakers