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