- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeOBL
- OBNOC
- Ocaoce
- OceOco
- OcoOct
- Octodd
- ODDODE
- ODEOdo
- OdoOf
- OfOff
- OffOff
- OffOgr
- OgrOh
- OHOhm
- OhmOiz
- OizOka
- OkaOkl
- OklOla
- OlaOld
- OldOld
- OldOle
- OleOli
- OliOli
- OliOlo
- OloOly
- OlyOm
- OmOme
- OmeOmn
- OmnOn
- OnOne
- OneOne
- OneOne
- OneOne
- OneONL
- ONLOno
- OnoOoh
- OohOpa
- OpaOpe
- OpeOpp
- OppOra
- ORAOra
- OraOrb
- OrcOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- OriOrl
- OrlOrp
- OrpOrq
- OrqOrt
- OrtOs
- OSOsc
- OscOsi
- OsiOso
- OspOsw
- OswOth
- OthOtt
- OttOtt
- ottOur
- OurOut
- OutOut
- OutOut
- OutOVA
- OvaOve
- OveOvn
- OvnOwe
- OweOxf
- OxfOz
- OzOzo
- Ozoozz
- Ola que quería ser Chau, La
- Ola Runt
- Ola Sweet
- Ola, Andre
- Olachea, Melissa
- Oladipo, Victor (NBA basketball player performed on The Masked Singer TV show)
- Oladokum, Joy
- Oladokum, Joy ft. McRae, Jensen
- Oladokum, Joy with Penny and Sparrow
- Oladokun, Joy
- Oladokun, Joy & Stapleton, Chris
- Oladokun, Joy & Tim Gent
- Oladokun, Joy feat. McRae, Jensen
- Oladokun, Joy feat. Stapleton, Chris
- Oladokun, Joy ft. McRae, Jensen
- Oladokun, Joy with Kahan, Noah
- Oladokun, Joy with Manchester Orchestra
- Oladokun, Joy with Morris, Maren
- Oladokun, Joy with Penny and Sparrow
- Olaf
- Olaf & Hans (Folk Pop Party)
- Ólafur, Grétar
- Oláh Gergő
- Oláh, Ibolya
- Olaisen, Ylva (Norwegian pop artist)
- Olaisen, Ylva & Brenner, Stig
- Olaiya, Victor (Nigerian trumpeter)
- Olakira (Adefemi Ebenezer, Nigerian producer)
- Olakira & Davido
- OLAM (hardcore)
- Olam Ein Sof ("Olam Ein Sof" translates to "World of the Infinites")
- Olamide (Nigerian Hip Hop artist)
- Olamide & BOJ
- Olamide & Fxrtune
- Olamide & Popcaan
- Olamide & Wizkid
- Olamide feat. Buckwyla
- Olamide feat. Kida Kudz
- Olamide feat. Minus2
- Olamide feat. Phyno
- Olamide feat. Savage, Tiwa
- Olamide, Dre, Dr. & Spinall
- Olamide, Vibez, Seyi & Muyeez
- Olamide, Vibez, Seyi, Asake, Jonn, Young feat. Daecolm
- Olamide, Wizkid & Darkoo
- OLAN (electronic/alternative singer‐songwriter, producer, multi‐instrumentalist)
- Olan, Ray y su Sasón
- Olander, Jeremy
- Olaniran, Tunde
- Olaniran, Tunde feat. Invincible
- Olare Utseoritsenere Prosper
- Olari, Silvia
- OLAS
- Olas, Las
- Olasoji, Wale
- Olathia (Heavy metal band from Cleveland, Ohio)
- Olatuja, Alicia
- Olatuja, Michael (UK electric and acoustic bassist/composer, based in New York)
- Olatunji (alias for Olatunji Yearwood. Trinidadian soca artist.)
- Olatunji, Babatunde
- Olavo Lüpia
- Olay, Ruth
- OLBRY
- Olcay, Zuhal
- Olcay, Zuhal & Onural, Cengiz
- Old (grindcore / industrial metal band, aka O.L.D.)
- Old (German black/thrash metal)
- Old & In the Gray
- Old & In the Way
- Old 97’s
- Old 97’s & Jennings, Waylon
- Old Abram Brown
- Old Accusers
- Old Again
- Old Apparatus
- Old Bear Mountain
- Old Best Friend
- Old Blind Dogs
- Old Blood (acid doom band from California)
- Old Breakout (blues rock)
- Old Caltone
- Old Canes
- Old Cat's Drama
- Old Cecil (UK prog folk/rock group)
- Old Ceremony, The
- Old City (Justin Mayer and MC/lyricist Tr38cho)
- Old Coke
- Old Corpse Road (UK / symphonic black metal with folk influences)
- Old Crow Medicine Show
- Old Crow Medicine Show feat. Ferrell, Sierra
