- O
- OO
- OO
- OO
- OOak
- OakOat
- OatObi
- ObiObs
- ObsOce
- OceOce
- OceOct
- OctOdd
- OddOde
- OdeODM
- OdmOer
- OerOff
- OffOff
- Offogo
- OGROh
- OhOhm
- OHMOja
- OjaOka
- OkaOkt
- OktOla
- OLAOld
- OldOle
- OleOli
- OliOli
- OliOll
- OllOLU
- OluOm
- OmOme
- OmeOmo
- OMOOna
- OOne
- OneOne
- OneOne
- oneOne
- ONFOnl
- Onl
- Oon
- OonOpe
- OpeOpi
- OpiOpu
- OpuOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrg
- OrgOri
- OriOri
- OriOrm
- OrmOrp
- OrpOrr
- OrrOrt
- OrtOsb
- OsbOsc
- OscOsl
- Osl
- OstOte
- OTFOtr
- OTROtt
- OttOur
- ourOut
- OutOut
- OutOut
- OutOVE
- OVEove
- OveOVS
- OvtOWI
- OwiOxl
- OxlOzc
- OzcOzu
- Ozuozz
- 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 Remains (Based in Switzerland)
- One Dead Three Wounded
- One Desire (Melodic rock band from Finland)
- 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 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 King Down
- One Last Glance
- One Last Wish
- 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 Rodeo
- 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
- ONE OK ROCK feat. Carter, Tyler
- ONE OK ROCK feat. Gaskarth, Alex
- ONE OK ROCK feat. Lavigne, Avril
- ONE OK ROCK feat. Swims, Teddy
- ONE OK ROCK featuring Quinn, Kellin from Sleeping with Sirens
- ONE OR EIGHT
- ONE PACT
- One Path
