- 1 Owsey
- 2 Omar Hakim
- 3 Obie Trice
- 4 OmenXIII
- 5 Ola Gjeilo
- 6 Overload
- 7 OMFG
- 8 Obadiah Brown-Beach
- 9 Owen Jones
- 10 Omar Noir
- 11 Oskar
- 12 OMB Peezy
- 13 Omiki
- 14 Olly James
- 15 Oliver $
- 16 OG Maco
- 17 Ozuna
- 18 Orjan Nilsen
- 19 Oliver Shanti
- 20 OsamaSon
- 21 Oliver Green
- 22 Ozo
- 23 Oshri
- 24 Oscar Yuan
- 25 OMB Bloodbath
- 26 Oyster
- 27 Omari Hardwick
- 28 Old Sea Brigade
- 29 ORF Symphony Orchestra
- 30 Open Mike Eagle