- 1 Olivia Rodrigo
- 2 Olivera
- 3 OR3O
- 4 Olivia Dean
- 5 Oly
- 6 One T
- 7 Otilia
- 8 Ofrin
- 9 Olivia Addams
- 10 Oonagh
- 11 Olivia O'Brien
- 12 Olivia Newton-John
- 13 Origa
- 14 Orla Fallon
- 15 ooxygen
- 16 Olivia Broadfield
- 17 Oh Susanna
- 18 Orenda Fink
- 19 Orianthi
- 20 Oh Land
- 21 Olivia Theresa Longott
- 22 Olivia Henken
- 23 Ornella Vanoni
- 24 Odetta
- 25 oleta adams
- 26 Omara Portuondo
- 27 Ophélie Winter
- 28 Orli Shaham
- 29 Oumou Sangaré
- 30 Olia Tira