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