- O
- OO
- OO
- OOak
- OakOb
- ObeOBO
- ObrOce
- OceOch
- Och
- OctODE
- OdeODO
- odoOf
- OfOff
- OffOgr
- OgrOh
- OhaOis
- OisOka
- OkaOku
- OkuOlc
- OldOld
- OldOli
- OliOli
- OliOls
- OlsOma
- OmaOme
- OMFOn
- OnOne
- OneOne
- ONEOne
- oneOnk
- OnkOnT
- OntOor
- OorOpe
- OpeOpu
- OpuOra
- OraOrc
- OrcOrd
- OrdOrh
- OrhOri
- OriOrl
- OrlOrq
- OrqOrt
- OrtOsa
- OsaOsc
- OscOsm
- Osn
- Otr
- OtrOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOxi
- OxiOze
- ozz
- 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 PACT
- One Path
- One Piano
- One Piece (electronic)
- One Piece Puzzle (Rock Band in the US)
- One Red Martian
- One Revolution
- One Ring Zero
- One Second 2 Late
- One Second Thought (New York City hardcore band)
- 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 South Lark
- 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 Trio
- One Up Downstairs, The
- One Voice (Filipino-American R&B girl group)
- One Voice
- One Voice Children’s Choir
- One Voice Children’s Choir feat. Rob Landes
- One Waka
- One Way (United States R&B/funk)
- One Way feat. Hudson, Al
- One Way featuring Hudson, Al
- One Way Letter
- One Way Ride
- One Way System (Fleetwood UK punk band)
- One Way Worship
- One Win Choice
- One Without
- One Year Later
- One Zillion Decibels (Belgian metal / stoner rock band)
- 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‐T feat. Cool‐T
- One‐Two‐Three (concept group with Bobby Orlando)
- One, Albert
- One, Andrew
- One, Audio
- One, Peter (African folk artist)
- One, Player (Synthwave)
- One, Res
- One, The (Hip Hop Artist)
- One, The (boyband "One More Chance")
- ONE: A Worship Collective
- One11Twenty
- One2s, The
- ONEDEFINED (Dutch-born techno producer with Moroccan roots)
- Oneeva
- onefive
- onefour (Drill Group from Western Sydney)
- Onefour (sydney rapper)
- OneFromTheNorth
- Oneheart (Russian lo‐fi, phonk, wave and ambient beatmaker)
- onehundredhours
- Oneida (experimental rock band from Brooklyn)
- Oneil (Russian Artist)
- Oneiroid Psychosis
