- Only At Nite
- Only Attitude Counts
- Only Boys Aloud
- Only Child
- Only Child
- Only Child
- Only Cowboys Stay In Tune
- Only Crime
- Only Ed and the Almost
- Only Flesh
- Only Fools and Horses
- Only for the Blunted
- Only Freak
- Only Grace
- Only In Dreams
- Only In The Dark
- Only in the Mornings
- Only in the Night
- Only Living Boy
- Only Living Witness
- Only Lovers Left Alive
- Only Men Aloud
- Only Men Aloud [Artist]
- Only Now Existing
- Only Once
- Only One
- Only Ones
- Only Paradise
- Only Seven Left
- Only Son
- Only Ten Left
- Only The Message Mattered
- Only Us
- Only Won
- Only Yesterday
- Only You
- Only You're Dreaming
- Onlybeat
- OnlyChiefa
- onlyforward
- onlyone
- Onm
- Onmutu Mechanicks
- Onmyo-Za
- 陰陽座
- Onna
- Onna-Kodomo
- Onney
- Onni Gideon
- Onni Gideon ('Crazy' Gideonin Gipsy Rockers)
- Onni Kuivalainen
- Onni Laihanen
- Onnie