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