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