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