| Trans-Siberian Orchestra | ClassicPop | 3 |
| Oscar Benton | Blues | 1 |
| Obe Dve | Independent music | 1 |
| Oleg Smith | Rap | 1 |
| Onerah | Rap | 1 |
| Fall Out Boy | RapPopRockPop Rock | 5 |
| Oliver Heldens | Dance musicPopElectronic music | 4 |
| Oleg Miami | Pop | 13 |
| OFFMi | Rap | 1 |
| Onlife | Rap | 1 |
| The Offspring | Alternative rockRock | 5 |
| System of a down | Rock | 3 |
