- 1 Olivia Rodrigo
- 2 Olivia Dean
- 3 OR3O
- 4 Otilia
- 5 Origa
- 6 Orianthi
- 7 One T
- 8 Oonagh
- 9 ooxygen
- 10 Olivia Newton-John
- 11 Orla Fallon
- 12 Olivia Herdt
- 13 Olivia Broadfield
- 14 Oh Susanna
- 15 Orenda Fink
- 16 Oh Land
- 17 Olivia Theresa Longott
- 18 Olivia Henken
- 19 Ornella Vanoni
- 20 Odetta
- 21 oleta adams
- 22 Omara Portuondo
- 23 Ophélie Winter
- 24 Orli Shaham
- 25 Oumou Sangaré
- 26 Olia Tira
- 27 OK Sweetheart
- 28 Olivia Kay
- 29 Orelia Has Orchestra
- 30 Olivia Holt