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