- Opposition of One
- Opposition, The (London post‐punk band)
- Oppressed, The (Welsh punk/oi)
- Oppressor (US technical death metal)
- Opprobre
- Opprobrium
- Opshop
- Opsomer, Barbara (Belgian singer)
- Opti-Pop
- Optic
- optic core (experimental electronic/dance producer)
- Optiganally Yours
- Optimo (UK techno duo)
- Óptimo (bachata group/artist)
- Optimus (US rapper, aka Jordy Towers)
- Optimus Rhyme (US nerdcore hip hop group)
- Optiv & BTK
- Opto (Alva Noto + Opiate)
- Opus (Austrian band; track: “Live Is Life”)
- Opus & Ambros, Wolfgang
- Opus & S.T.S.
- Opus 4 (French gipsy swing quartet)
- Opus 78
- Opus Atlantica
- Opus Avantra
- Opus Cuatro
- Opus Däi
- Opus feat. Jerey, Fritz
- Opus featuring Falco
- Opus featuring Gruber, Peter Niklas
- Opus featuring Kolonovits, Christian
- Opus III (English techno and house music)
- Opus III (Swedish trio)
- Opus Kink
- Opus Orange
- Opus Pro
- OQuadro
- Oquendo, Manny y Libre
- Oquendo, Manny's Libre
- Oques Grasses
- OR (French Rap)
- Or du Commun, L’ (Belgian hiphop)
- Or du Commun, L’ feat. Elvis, Roméo
- Or Noir (French TV show)
- Or, Rotem
- OR3O
- Ora (Andrew Chalk & Darren Tate)
- ORA (classical choir)
- Ora Mate
- Ora the Molecule
- Ora, Rita
- Ora, Rita feat. Brown, Chris
- Ora, Rita feat. Cardi B, Rexha, Bebe & Charli XCX
- Ora, Rita feat. Cole, J.
- Ora, Rita feat. Fatboy Slim
- Ora, Rita feat. Michaels, Julia
- Ora, Rita feat. Tempah, Tinie
- Ora, Rita feat. will.i.am
- Ora, Rita x Guetta, David x Imanbek
- Ora, Rita x Guetta, David x Imanbek feat. Gunna
- Ora, Rita x Imanbek feat. Khea
- Oracle Sisters (Band from Paris, France)
- Oracles (indie psychedelic rock band from Berlin)
- Oraculum (US Progressive Metal/Shred band)
- Orakle
- Oral Bee
- ORAL CIGARETTES, THE
- Oral Tunerz starring Whigfield
- Oram, Tara
- Orange (California punk band)
- Orange (world music / percussion)
- Orange 9mm
- Orange and Lemons (Filipino pop rock band)
- Orange Bicycle
- Orange Blossom
- Orange Blue (Hamburg)
- Orange Blue (Italian dance project)
- Orange Can
- Orange Caramel (After School subgroup)
- Orange Goblin
- Orange Grove
- Orange Island
- Orange Juice (Scottish post-punk band from 70s-80s)
- Orange Lights, The
- Orange Ocean (Orange Ocean)
- Orange Orange
- Orange Park
- Orange Peels, The
- orange pekoe (real‐world J‐pop duo)
- ORANGE RANGE
