- O
- OO
- OO
- OOas
- OatObl
- OblOce
- OceOck
- OckOda
- OdaODE
- ODEOes
- OetOff
- offO
- OGXOhi
- OhiOjo
- OjoOkl
- OklOlc
- OldOle
- OleOli
- OliOls
- OlsOma
- OmaOmn
- OmnOnc
- OncOne
- OneOne
- OneOnl
- OnlOOB
- OobOpe
- OpeOps
- OptOra
- OraOrc
- OrcORE
- OREOri
- OriOrl
- OrlOrq
- OrqOrw
- OrxOsc
- OscOsm
- OsmOte
- Oteott
- OttOui
- OuiOut
- OutOut
- OutOve
- OveOvi
- OviOwl
- OwlOys
- OysOZZ
- One Life Crew
- One Light Out
- 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 Minute Silence
- One More Girl
- One More Time
- One Morning Left
- One Nation Under (American metalcore band)
- One Night Only
- One Night Rodeo
- One Night Stand (Punk rock from Belgium)
- 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 Path
- One Piece (electronic)
- One Piece Puzzle (Rock Band in the US)
- One Red Martian
- One Revolution
- One Ring Zero
- One Second 2 Late
- One Self
- One Sentence. Supervisor
- One Shot (French hip-hop collective)
- One Six Conspiracy
- One Sixth of Tommy
- One Small Step For Landmines
- One Sonic Society
- 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 the Juggler
- One Time Weekend
- One Ton
- One Track Mind (track "I Like U")
- One True God
- One True Pairing (project of Tom Fleming, formerly of Wild Beasts)
- One True Thing
- One True Voice
- One Two (Danish pop group)
- One Two Three
- One Two Trio
- One Up Downstairs, The
- One Voice (Filipino-American R&B girl group)
- One Voice
- One Voice Children’s Choir
- One Waka
- One Way (United States R&B/funk)
- One Way feat. Hudson, Al
- One Way featuring Hudson, Al
- One Way Ride
- One Way System (Fleetwood UK punk band)
- One Way Worship
- One Win Choice
- One Without
- One Year Later
- One-Eared Boy
- One-Eyed Doll
- One-Two (defunct French duo Frédéric Beucher and Séverin)
- One-Way Mirror
- One‐T
- One‐T + Cool‐T
- One‐T + Cool‐T
- One, Albert
- One, Peter (African folk artist)
- One, Player (Synthwave)
- One, Res
- One, The (Hip Hop Artist)
- One, The (boyband "One More Chance")
- One11Twenty
- ONEDEFINED (Dutch-born techno producer with Moroccan roots)
- Oneeva
- onefive
- onefour (Drill Group from Western Sydney)
- Onefour (sydney rapper)
