| Orchestral Manoeuvres in the Dark (OMD) | PopElectronic musicSynth-pop | 5 |
| Omar Rudberg | PopR'n'B | 4 |
| Bad Omens | Heavy metalHard rockRockAlternative rock | 4 |
| That Mexican OT | Rap | 1 |
| Royel Otis | Pop | 1 |
| Orville Peck | Country musicPop | 1 |
| Oliver Frank | PopPop genre | 2 |
| Olga Seryabkina | PopDance musicRap | 6 |
| Evgeny Osin | PopPop genre | 7 |
| KISS OF LIFE | Pop | 1 |
| Bachman-Turner Overdrive | RockHard rock | 3 |
| Ostap Parfenov | Pop | 3 |
