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