- O
- OO
- OO
- OOak
- OakObe
- ObeObs
- ObsOce
- OceOCT
- OctOda
- OdaODE
- ODEODU
- ODUOfe
- OfeOG
- OGOh
- OhOhl
- OhmOjo
- Ojookg
- okhOla
- OlaOld
- OldOle
- OleOli
- OliOlm
- OLMOma
- OmaOme
- OmeOmo
- OMPOnd
- OndOne
- Oneone
- oneONJ
- OnkOns
- Ons
- OosOpe
- OpeOpu
- OpuOra
- OraOrc
- OrcOre
- OreOri
- OriOri
- OriOro
- OroOrq
- OrqOrv
- OrvOsb
- OsbOsk
- OskOst
- Oth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOva
- OvaOve
- OveOwe
- OweOxf
- Oxf
- OZZ
- Oladokun, Joy & Stapleton, Chris
- Oladokun, Joy & Tim Gent
- Oladokun, Joy feat. Stapleton, Chris
- Oladokun, Joy ft. McRae, Jensen
- Oladokun, Joy with Manchester Orchestra
- Oladokun, Joy with Morris, Maren
- Oladokun, Joy with Penny and Sparrow
- Olaf & Hans (Folk Pop Party)
- Ólafur Arnalds (Icelandic multi‐instrumentalist and producer)
- Ólafur Arnalds & Dan, Arnór
- Ólafur Arnalds & Frahm, Nils
- Ólafur Arnalds & JFDR
- Ólafur Arnalds & Ott, Alice Sara
- Ólafur Arnalds and Frahm, Nils
- Ólafur Arnalds feat. Dan, Arnór
- Ólafur Arnalds feat. JFDR
- Ólafur Arnalds ft. SOHN
- Oláh Gergő
- Oláh, Ibolya
- Olaisen, Ylva (Norwegian pop artist)
- Olaisen, Ylva & Brenner, Stig
- Olaiya, Victor (Nigerian trumpeter)
- Olakira (Adefemi Ebenezer, Nigerian producer)
- Olam Ein Sof ("Olam Ein Sof" translates to "World of the Infinites")
- Olamide (Nigerian Hip Hop artist)
- Olamide feat. Phyno
- OLAN (electronic/alternative singer‐songwriter, producer, multi‐instrumentalist)
- Olan, Ray y su Sasón
- Olander, Jeremy
- Olaniran, Tunde
- Olare Utseoritsenere Prosper
- Olari, Silvia
- Olasoji, Wale
- Olathia (Heavy metal band from Cleveland, Ohio)
- Olatuja, Michael (UK electric and acoustic bassist/composer, based in New York)
- Olatunji (alias for Olatunji Yearwood. Trinidadian soca artist.)
- Olatunji, Babatunde
- Olay, Ruth
- Olcay, Zuhal
- Olcay, Zuhal & Onural, Cengiz
- Old (grindcore / industrial metal band, aka O.L.D.)
- Old
- Old & In the Gray
- Old & In the Way
- Old 97’s
- Old 97’s & Jennings, Waylon
- Old Abram Brown
- Old Again
- Old Bear Mountain
- Old Blind Dogs
- Old Blood (acid doom band from California)
- Old Breakout (blues rock)
- Old Canes
- Old Cat's Drama
- Old Cecil (UK prog folk/rock group)
- Old Ceremony, The
- Old Coke
- Old Corpse Road (UK / Symphonic Black Metal with Folk influences)
- Old Crow Medicine Show
- Old Crow Medicine Show feat. Ferrell, Sierra
- Old Crow Medicine Show feat. Staples, Mavis
- Old Crow Medicine Show feat. Watson, Willie
- Old Daisy
- Old Dead Tree, The
- Old Dogs
- Old Dominion (Hungarian black metal band)
- Old Dominion (US country band)
- Old Dominion (feat. Little Big Town)
- Old Dominion & Moroney, Megan
- Old Fire
- Old Firm Casuals, The
- Old Flame (United States Rock Band feat. Jonny Craig)
- Old Funeral
- Old Gods of Asgard
- Old Gods of Asgard feat. Wake, Alan & Mr. Door
- Old Gray
- Old Heavy Hands
- Old Horn Tooth
- Old Loaves (New Zealand post rock/metal)
- Old Man Canyon
- Old Man Gloom
- Old Man Lizard
- Old Man Luedecke
- Old Man Markley
- Old Man River
- Old Man Saxon
- Old Man Wizard
- Old Man’s Child
- Old McBezen & Dungaree Dan
- Old Merry Tale Jazzband
