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