- O
- OO
- OO
- OO
- OO
- OOak
- OakObe
- ObeObl
- OblObu
- ObOce
- Oceoch
- OchOct
- OctOdd
- OddOde
- OdeODI
- OdiOdy
- OdyOfe
- OfeOff
- OffOga
- OgaOh
- OhOh
- OhOht
- OhtOji
- OjiOKA
- OKAOkt
- OktOla
- OlaOld
- OldOld
- OldOle
- OleOli
- OliOli
- OliOlo
- OloOly
- OlyOm
- OmOme
- OMEOmn
- OmnOn
- ONOnd
- OndOne
- OneOne
- OneONE
- OneOni
- Onionl
- OnmOny
- OnyOos
- OosOpe
- OpeOpi
- OpiOpu
- Opvora
- OraOrb
- OrbOrc
- OrcOrd
- OrdOre
- OreOri
- OriOri
- OriORK
- OrkOrn
- OROOrq
- OrqOrr
- OrrOrt
- OrtOsa
- OsaOsc
- OscOsk
- OskOss
- OssOta
- OtaOth
- OthOtt
- Ottott
- OTTOur
- OurOut
- OutOut
- OutOut
- OutOVA
- OVAOve
- OveOvi
- OviOwe
- OweOwu
- OwuOxy
- Oxy
- Ozy
- Ozzozz
- Ondrej Ďurica
- 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 (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 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
