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