- 1 Olivia Dean
- 2 Oceanside
- 3 Ony
- 4 Olga Lounova
- 5 Odessa
- 6 Otilia
- 7 Ornella Vanoni
- 8 oneil
- 9 Olga Glazova
- 10 One-T
- 11 Omara Portuondo
- 12 Oana Radu
- 13 Olivia Grace
- 14 Oh Susanna
- 15 Olivia Addams
- 16 Oxana
- 17 Oceana
- 18 Oly
- 19 Olivia Herdt
- 20 Ona
- 21 Olivia Lane
- 22 Orianthi
- 23 Orkid
- 24 Oh Land
- 25 Olivia Belli
- 26 Orquestra De Cambra Catalana
- 27 Oly.
- 28 OR3O
- 29 Olivia Garcia
- 30 Ora Cogan