- O
- OO
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- OOak
- OakObe
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- oblObs
- ObsOce
- OceOch
- OchOCT
- OctODC
- ODCOdd
- OddOde
- OdeODU
- ODUof
- ofOFF
- OffOFK
- OfMOgr
- OgrOh
- OhOhi
- OhiOim
- OimOK
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- OkeOl
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- OleOlg
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- OneOnk
- OnkOno
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- OutOv
- OvOve
- OveOVE
- OVEOwe
- OweOwl
- OwlOxm
- OxmOza
- OzaOzo
- OzoOzz
- 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 Be Lo feat. Magestik Legend
- One Big Game
- One Bit & Cyrus, Noah
- One Block Radius
- One Blood (British reggae group)
- One Buck Short
- One Chance
- 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 Frequency United (melodic punk duo from South Fulton, Tennessee)
- 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))
