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