- O
- OO
- OO
- OO
- OO
- oOak
- OakObe
- ObeObl
- OBLOC
- OCOce
- OceOCN
- OCn
- OctOdd
- OddOde
- OdeOdo
- OdoOet
- OetOff
- OffOff
- OffOgl
- OglOh
- OhOhl
- OhlOis
- OisOKA
- OkaOKI
- OkkOl
- OlOld
- OldOLD
- OldOle
- OleOli
- OliOli
- OliOlm
- Olu
- Oma
- OmaOme
- OmeOmn
- OmnOn
- OnOnd
- OndOne
- OneOne
- OneONE
- OneOni
- OniOnm
- OnMOny
- OnyOos
- OosOpe
- OpeOpo
- OpoOqu
- OquOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOrf
- OrfOri
- OriOri
- OriOrl
- OrlOro
- OroOrq
- OrqOrt
- OrtOS
- OSOsb
- OsbOsh
- OshOsm
- OsmOST
- OSTOth
- OthOtr
- OtrOtt
- OttOum
- OunOUT
- OutOut
- OutOut
- OutOuu
- OuvOve
- OveOvi
- OviOwe
- OweOws
- OwsOxy
- Oxy
- OZZ
- OZZozz
- Ondes Martenot, Les
- Ondina (eurodance vocalist)
- Ondolindë (Turkish Melodic Death Metal)
- Ondra, Jakub (Czech vocalist, guitarist and songwriter)
- Ondrasik, John
- Ondreaz
- Ondřej Havelka a jeho Melody Makers
- Ondskapt (Swedish black metal)
- Ondt Blod (Norwegian hardcore punk band)
- OnDubGround
- OnDubGround feat. Brother Culture
- One (Greek/Cypriot pop boyband)
- One (Florida hard rock band)
- One (Canadian reggae group)
- One (UK rap crew, w/ members Sway, Pyrelli, etc.)
- ONE (South Korean rapper)
- One (80s UK band with Steve Hovington & Seven Webster)
- One 2 (US rapper)
- One 2 Many
- ONE 3rd NOTES
- One Acen
- One Acen feat. WSTRN
- One Adam 12
- One AM Radio, The
- One America (One America)
- One Bad Pig
- One Bad Son
- One Be Lo
- One Be Lo feat. Decompoze
- One Be Lo feat. Kadi
- One Big Game
- One Bit & Cyrus, Noah
- One Block Radius
- One Buck Short
- One Chance
- One Chance feat. Fabo
- ONE CHiN
- One Choice
- One Click Straight (Alternative Filipino Band)
- One Cool Guy
- 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 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 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
