- 1 Odessa
- 2 Otilia
- 3 Olivia Belli
- 4 Olivia Dean
- 5 OR3O
- 6 Olga Lounova
- 7 Olivia Addams
- 8 Orkid
- 9 Olivera
- 10 Olivia Herdt
- 11 Ony
- 12 Origa
- 13 Oceana
- 14 Oh Susanna
- 15 Otis McDonald
- 16 OSTON
- 17 ooxygen
- 18 Odetta
- 19 Ornella Vanoni
- 20 Oh Land
- 21 Okay Kaya
- 22 One-T
- 23 Olivia Broadfield
- 24 Olivia Ruiz
- 25 Ofelia
- 26 Olivia Newton-John
- 27 Olivia O'Brien
- 28 Orianthi
- 29 Ofelia Del Rosal
- 30 Olivia Foa'i