- o-town
- o-zone
- oasis-and-microsoft-songsmith
- oasis
- obadiah-parker
- obskur
- ocean-ou
- oceanlab
- oceansize
- ochre
- octagen-and-arizona
- octavia
- odd-future
- oddstantine
- odesza
- of-monsters-and-men
- of-montreal
- ofenbach
- official-hige-dandism
- offonoff
- offroadunicycler
- ogge
- oh-land
- oh-my-girl
- oh-wonder
- ohio-players
- oily-bastard
- oingo-boingo
- ok-go
- okage-shadow-king
- okazaki-ritsuko
- ola-gjeilo
- ola
- old-crow-medicine-show
- old-dominion
- old-spice
- ole-ole
- oleg-berg
- oleg-kirilkov
- oleksa-lozowchuk
- olexandr-ignatov
- olive
- oliver-heldens
- oliver-tree-and-robin-schulz
- oliver-tree
- oliver
- olivia-eden-from-the-voice
- olivia-lane
- olivia-newton-john
- olivia-rodrigo