- 1 Olivia Rodrigo
- 2 Olivia Dean
- 3 Olivera
- 4 Oonagh
- 5 Orianthi
- 6 OR3O
- 7 Otilia
- 8 Olivia Newton-John
- 9 Origa
- 10 ooxygen
- 11 Olia Tira
- 12 Olivia O'Brien
- 13 Ofelia K
- 14 Olive Beat
- 15 Orkid
- 16 Ofrin
- 17 Oly
- 18 Olidena
- 19 Olivia Addams
- 20 One T
- 21 Olivia Belli
- 22 Ornella Vanoni
- 23 Omara Portuondo
- 24 Olivia Herdt
- 25 Olivia Holt
- 26 Orla Fallon
- 27 Olivia Broadfield
- 28 Oh Susanna
- 29 Orenda Fink
- 30 Oh Land