- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- OblObs
- ObsOce
- OceOch
- Ochoct
- OctOdd
- OddOdd
- OddOde
- OdeODU
- ODUOf
- OfOff
- OffOfo
- OfoOgr
- Ogroh
- Oh
- OhmOis
- OisOKA
- OkaOki
- OkiOl
- OlOLB
- OlcOld
- OldOle
- OleOli
- OliOli
- OliOll
- OllOls
- OlsOma
- OmaOMB
- OMBOMI
- OMIOmo
- OmoOna
- OnaOne
- OneONE
- ONEOne
- OneOne
- oneOnl
- Onl
- OnoOOJ
- OOJOpa
- OpaOpe
- OpeOpp
- OppOR
- OraOra
- OraORB
- OrbOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- OriOrl
- OrlOro
- OroOrq
- OrqOrt
- OrtOS
- OsOsb
- OsbOsh
- oshOsm
- OsmOst
- OstOte
- OteOTP
- OTROtt
- OttOub
- OubOur
- OurOut
- OutOut
- OutOut
- OutOve
- OveOve
- OveOVO
- OVROwe
- OweOxf
- OxfOys
- Oysozi
- OziOzz
- One Chance feat. Fabo
- ONE CHiN
- One Choice
- One Click Straight (Alternative Filipino Band)
- One Culture
- One Culture & Mellodose
- One Dae
- One Day (Australian hip-hop)
- One Day Alive (Heavy Metal Band)
- One Day as a Lion
- One Day Hero
- One Day in Pain
- One Day Remains (Based in Switzerland)
- One Day, After School
- One Dead Three Wounded
- One Desire (Melodic rock band from Finland)
- One Desire & Rönning, Geir
- One Dimensional Creatures (Manchester, UK - alt punk/post-punk/grunge)
- One Dimensional Man
- One Direction (English‐Irish pop boy band)
- One Dollar Short
- One Dove
- ONE DRAFT
- One Drop (reggae group)
- One dying wish (Italian band)
- One eskimO
- One Eye Closed
- One Eyed Moon (garage/punk/stoner rock band from Atlanta, Georgia)
- One Fall
- One Fine Day (German rock/punk band)
- One Flew South
- One Flew West
- One Foot in the Grave
- One for All (Jazz Group)
- One for the Team
- One for the Team (Indie Rock band from Minneapolis MN)
- One Function (Psytrance project from Israel [Jenia Akerman])
- One Hacker Band
- One Hello World
- One Hit Wonder (California punk band)
- One Hope
- One Horse Band
- One Hundred Hours
- One Hundred Steps (Portugese post-hardcore band)
- One Hundred Thorns
- One Hundred Thousand
- One Hundred Year Ocean
- One Hundred, The
- One I Cinema
- One in a Googolplex
- One in a Million (1960s Scottish psychedelic band)
- One in a Million (Dutch rock/ska band)
- One In The Chamber (Rock Band)
- One Inch Giant
- One Inch Punch (grunge/hip hop duo from Los Angeles)
- One King Down
- One Last Glance
- One Last Wish (Washington D.C. 1980s emo band)
- One Leg Mary (Greek Alternative/Post-Hardcore Band)
- One Less Reason
- One Life Crew
- One Light Out
- One Little Plane
- One Love Family
- One Machine
- One Man and His Droid
- One Man Army (USA punk band)
- One Man Army and the Undead Quartet
- One Man Boycott (One Man Boycott (Band))
- One Man's Trash (AOR project)
- One Million Bulgarians
- One Million Dollars
- One Minute Silence
- One more chance
- One More Girl
- One More Time
- One Morning Left
- ONE N' ONLY
- One Nation Crew (gospel vocal)
- One Nation Under (American metalcore band)
- One Night Band, The (Montreal ska band)
- One Night Only
- One Night Stands, The
- One O'Clock Humph
- One O’Clock Lab Band
- One of a Kind (rock band)
- One of the Last
- One of Us
- ONE OK ROCK
- ONE OK ROCK feat. 5 Seconds of Summer
