- O
- OO
- OO
- OOak
- OakOb
- ObeObo
- OBOOce
- OceOch
- OchOct
- Odd
- OddODM
- ODOOf
- OfOff
- OFFOgr
- OgrOh
- OhOIR
- OirOKA
- OkaOku
- OkuOla
- OlaOld
- OldOli
- OliOli
- OliOls
- OlsOMA
- OmaOme
- OmeOmo
- OMPOnd
- One
- OneOne
- OneONI
- OniOno
- OnoOom
- OomOpe
- OpeOpp
- OppOra
- OraOrb
- OrbOrc
- OrcOrg
- OrgOri
- OriOrk
- OrkOrp
- OrpOrr
- OrrOrv
- OrvOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOug
- OugOut
- OutOut
- OutOut
- OutOve
- Oveovr
- OVSOwl
- OwlOxy
- Oxy
- ozz
- One Man Boycott (One Man Boycott (Band))
- One Minute Silence
- 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 Only
- One Night Rodeo
- One Night Stand (Punk rock from Belgium)
- One of a Kind (rock band)
- One of Hours
- 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 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 God & Coka Cobra
- One True God & Croft, Lucille
- One True God × Coka Cobra
- One True God feat. Roniit
- One True God, Fancy Cars & Hollis
- 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
