- 1 Olivia Rodrigo
- 2 Olivera
- 3 Otilia
- 4 Oonagh
- 5 Orianthi
- 6 Olivia O'Brien
- 7 Olivia Newton-John
- 8 Olivia Broadfield
- 9 Oh Susanna
- 10 Orenda Fink
- 11 Oh Land
- 12 Olivia Theresa Longott
- 13 Olivia Henken
- 14 Ornella Vanoni
- 15 Odetta
- 16 oleta adams
- 17 Omara Portuondo
- 18 Ophélie Winter
- 19 Orli Shaham
- 20 Oumou Sangaré
- 21 Olia Tira
- 22 OK Sweetheart
- 23 Orelia Has Orchestra
- 24 Olivia Holt
- 25 One T
- 26 Origa
- 27 Oceana
- 28 Olivia Somerlyn
- 29 Olivia
- 30 Owlle