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