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