| O Muritoare |
| O Positivo |
| O Rappa |
| O Surto |
| O Teatro Mágico |
| O'lmas Olloberganov |
| O-Town |
| O-Zone |
| O. Torvald |
| O.D.HALL Jr. |
| O.N.A. |
| O.P.A., Oppressive People Attack |
| O.S.T.R |
| Oana Cătălina Chiţu |
| Oana Tomoioagă |
| Oasis |
| Obaid Juenda |
| Obie Bermudez |
| Obispo Pascal |
| OBK |
| Obojeni program |
| Obraten efekt |
| Obrint Pas |
| Obsidian Shell |
| Obús |
| Obyknovennoe Chudo |
| Ocean Drive |
| Ocean Ou |
| Oceana |
| Oceans Divide |
| Ochra spirochaete (Ωχρά σπειροχαίτη) |
| October Light |
| Oddział Zamknięty |
| Odilara |
| Odjila |
| OdnoNo |
| Odos Oneiron |
| Odysseas Elytis |
| Odysseas Moshonas |
| Odysseas Tsakalos |
| Odyssey |
| Odyssey (Pakistani band) |
| Oesch's die Dritten |
| Of Mice & Men |
| Of Monsters and Men |
| Of Montreal |
| Of the Wand and the Moon |
| of Verona |
| Ofer Bashan |
| Offenbach |
| Ofra Haza |
| Og Spanish Fly |
| Og'abek Sobirov |
| Ogie Alcasid |
| Ognjen Radivojevic Ogi |
| Ogun Sanlisoy |
| Oğuz Aksaç |
| oğuz berkay fidan |
| Oğuzhan Koç |
| Oğuzhan Uğur |
| Oh Hyun Ran |
| Oh la la! |
| Oh Land |
| Oh Laura |
| Oh Won Bin |
| Oh, Atoms |
| Oh, Sleeper |
| Ohad Hitman |
| Ohio Express |
| Oi Va Voi |
| Oingo Boingo |
| OJ Mariano |
| Ojos de Brujo |
| Ojra |
| OK Go |
| Okaber |
| Okan |
| Okean Elzy |
| Okey Ok |
| Okkervil River |
| Okoumé |
| Oksana Bilozir |
| Oksi |
| Oktem Altaev |
| Oktobar 1864 |
| Okyanus |
| Ola |
| Ola Svensson |
| Olaf Henning |
| Oláh Ibolya |
| Olavi Uusivirta |
| Oldelaf & Mr D. |
| Ole Ivars |
| Ole Paus |
| Oleg Anofriev |
| Oleg Gazmanov |
| Oleg Nejlik |
| Oleg Pogudin |
| Oleg Romanenko |
| Oleg Vynnyk |
