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- ObeOBL
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- oceOct
- OctOda
- OdbOdd
- OddOde
- OdeODU
- ODUOf
- OfOff
- OFFOfi
- Ofiogo
- OGROh
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- OilOk
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- OweOwl
- OwlOxl
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- OzaOzo
- OzoOzz
- Out of Service (US | rock)
- Out of Sight (electronic, Jesper Sidelmann & Michael Linde, "Comfort")
- Out of the Ashes
- Out of the Blue (The Oxford University acapella group)
- Out of the Blue (Yale University)
- Out of the Dawg House (Butler University's all-male a cappella group)
- Out of the Dust
- Out of the Dust (Christian husband and wife duo from Nashville, TN)
- Out of the Dust (Feat. Tillman, Tony)
- Out of the Grey
- Out of the Mouth of Graves (US Death Metal)
- Out of the Ordinary (German dance producer)
- Out of the Way (Boston rock band)
- Out Of Time
- Out of Vision
- Out of Work
- Out of Your Mouth (Canadian industrial rock band from Calgary)
- Out Of/Into
- Out Out
- Out Run
- Out the Car Window
- Out There feat. Rose, Blake
- Out to Win
- Out-Or
- Out-Reazon
- Out, No Way (Los Angeles hardcore punk band)
- Out4Blood
- Outasight (US rapper)
- Outatime
- Outatime Orchestra, The
- Outatime! (pop punk band)
- Outback (80s/90s world music group)
- Outback (Brighton Alt. Rock/Metal 3 piece, UK)
- Outblast, DJ
- Outblast, DJ & Angerfist
- Outblast, DJ & Angerfist feat. Watcher, MC Tha
- Outblast, DJ & Korsakoff
- Outbound
- Outboxx
- Outbreak (Hardcore rock band)
- Outbreak (Hardstyle dj " John-Paul Pirrello")
- Outbreakband
- Outburst (USA punk band)
- Outcast Crew, The
- Outcasts, The (1960s Texas garage/psych band)
- Outcasts, The (Northern Ireland punk band)
- Outcharms, The
- Outcry Collective
- Outdividuals, The
- Outdividuals, The feat. Torch
- Outdoor Type, The
- Outdoor Velour
- Outen, Savannah
- Outen, Savannah & Coco, Jake
- Outen, Savannah feat. Coco, Jake
- Outen, Savannah feat. Garcia, Andrew, Brustofski, Ali, Golden, Joshua & Hart, Caitlin
- Outen, van, Denise
- Outer (I'VE band)
- Outer (Italian progressive/djent metal band)
- Outer Darkness
- OUTER GLOOM
- Outer Heaven (American death metal)
- Outer Limits
- Outer Limits Recordings
- Outer Limits, The (Pop group from Leeds, England, late 1960s. Members included: Jeff Christie, Gerry Layton, Stan Drogie, Gerry Smith.)
- Outer Park
- Outer Shapes
- Outer Spaces (band from Baltimore)
- Outer Worlds
- Outerburst (Italian melodic groove metal band)
- Outergods (UK black metal/grindcore)
- Outerhope
- Outerloop
- Outernational
- Outerrings (Band)
- OuterSpace (US hip-hop group, Planetary & Crypt the Warchild)
- OuterSpace feat. Ill Bill
- OuterSpace feat. Immortal Technique
- OuterSpace feat. Paz, Vinnie
- OuterSpace feat. Sick Jacken
- Outerspace, Izzy
- Outerspass
- Outfield Clovers, The (Atlanta Indie/Emo Band)
- Outfield, The
- Outfit (drum and bass)
- Outfit (British band)
- Outfit, The (Chicago rock group)
- Outfit, TX, The
- Outforce & Hartshorn
- Outgoing Hikikomori
