- 1 Olivia Rodrigo
- 2 Olivera
- 3 OR3O
- 4 Olivia Addams
- 5 Otilia
- 6 Ony
- 7 Origa
- 8 One T
- 9 Oly
- 10 Olivia Newton-John
- 11 Olivia Broadfield
- 12 Oh Susanna
- 13 Orenda Fink
- 14 Orianthi
- 15 Oh Land
- 16 Olivia Theresa Longott
- 17 Olivia Henken
- 18 Ornella Vanoni
- 19 Odetta
- 20 oleta adams
- 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 Oceana
- 30 Olivia Somerlyn