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