- O
- OO
- OO
- OO
- OO
- oOak
- OakObe
- ObeOBL
- OBLOC
- OCOce
- oceOCn
- OcoOct
- OctOdd
- OddOde
- ODEOdo
- OdoOet
- ofOff
- OffOff
- OffOgl
- OglOh
- OhOHK
- OhlOis
- OisOK
- okoki
- okiOl
- OlOld
- OldOld
- OldOle
- OleOli
- OliOli
- OliOlm
- OlmOLU
- OluOma
- OmaOme
- OmeOmn
- OmnOn
- OnOnd
- One
- OneOne
- OneOne
- OneOni
- OniOnl
- OnlOny
- OnyOos
- OosOpe
- OpeOpi
- OpiOpu
- OpuOra
- OraOrb
- OrbOrc
- OrcOrd
- OrdOre
- OreOri
- OriOri
- OriOrl
- Orl
- OroOrq
- OrqOrs
- OrsOru
- OruOsb
- OsbOsc
- OscOsl
- OslOst
- OsTOte
- OteOTR
- OTROtt
- OttOud
- OueOur
- OurOut
- OutOut
- OUTOut
- OutOve
- OveOve
- OveOwe
- OweOwl
- OwlOxm
- OxmOzc
- OzcOzu
- OzuOZZ
- 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
- 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
- One Piano
- One Piece (electronic)
- One Piece Puzzle (Rock Band from Northeast Ohio)
- One Plus Two
- ONE PROJECT & JUN
- One Punch Wonder
- One Reason To Rise
- One Red Martian
- One Revolution
- One Ring Zero
- One Riot One Ranger
- One Second 2 Late
- One Self
- One Sentence. Supervisor
- One Shot (2000 French hip hop project to create a motive (Taxi 2) OST)
- One Shot (Jazz / prog rock band)
- One Six Conspiracy
- One Sixth of Tommy
- One Small Step For Landmines
- One Sonic Society
- One South Lark
- One Star
- One Step Beyond (experimental death metal band from Adelaide, Australia)
- One Step Beyond (Hardcore band from Berlin, Germany.)
- One Step Beyond (hip-hop trio Joe Summa, Val Black & Dee Cutz)
- One Step Beyond (electronic/house artist Wilson Santos)
- One Step Beyond (Belgian group)
- One Step Closer (hardcore)
- One Step Out
- One Strike Left (Hardcore, Punk Rock from Hannover, Germany)
- One Thousand Violins
- One Time Music x Sean Paul
- One Time Weekend
- One Ton (Canadian dance music act)
- One Track Mind (track "I Like U")
- One Tribe feat. Gem
- One True God
- One True God & Coka Cobra
- One True God & Croft, Lucille
- One True God × Coka Cobra
- One True God × Limbo Slice
- One True God feat. Roniit
- One True God, Fancy Cars & Hollis
