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