- 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
- OttOue
- OugOut
- OutOut
- OutOut
- OutOve
- OveOVR
- ovrOwl
- OwlOxx
- OxyOZR
- ozz
- Other Minds (Alternative Rock Band)
- Other Ones, The (Australian-German band, hit single "Holiday")
- Other Other Brothers, The
- Other Stars, The (Indie Rock)
- Other Tribe, The
- Other Two, The
- Other Voices (Italian goth)
- Other-ed
- Other, The (horrorpunk band from Germany)
- Other, The (US punk rock band)
- Otherkin
- OTHERLiiNE (George Fitzgerald & Lil Silva)
- Others by No One
- Others, The (UK dubstep producer)
- Others, The (2000s UK rock band)
- Otherview
- Otherwise (US hard rock band)
- Otherwise feat. Costello, Ashley
- Otherwish (Progressive house musician)
- Othila (neofolk / ambient group)
- Othman Wahabi
- Othmane Bali
- Othmer, Julia
- Otierre
- Otik (dance music)
- Otile Brown
- Otilia (Otilia Bruma)
- Otis (Alternative rock/post-grunge band from Phoenix, Arizona.)
- Otis (Mozambican saxophone player)
- Otis Junior & Dr Dundiff
- Otis Stacks
- Otis Zola
- Otis, Johnny
- Otis, Johnny, Show, The
- Otis, Shuggie
- Otlo
- Otnicka (Electronic Musician)
- Oto
- oto (Pascal Hubert, Farid Dahalb & François Rousseau)
- Otoboke Beaver
- Otomo, Yoshihide
- Otonose, Kanade (ReGLOSS)
- OTPendia
- OTR (Downtempo electronic producer)
- OTR & Au/Ra
- OTR & Bipolar Sunshine
- OTR & Panama
- OTR & Rory Wynne
- Otra Cara de la Nada, La
- Otra Fe, La
- Otra puse
- Otrabanda
- Otracami (project of Camila Ortiz)
- Otro
- Otro Grupo, El
- Otro Mambo
- Otro Nivel
- Otro Yo, El (Argentine rock band)
- Otros Aires
- Otros Colores
- Ots, Georg
- Otsochodzi (polish MC)
- Otsochodzi feat. Szopeen
- Otsochodzi feat. Włodi
- Otsochodzi feat. Young Igi
- Otsuka, Ai
- Ott (UK producer/psychedelic dub multi-instrumentalist)
- OTT (late '90s Irish boyband)
- Ott, Alice Sara (pianist)
- Ott, Carey
- Ott, Christine
- Ott, Kerstin (German (Berlin) Singer)
- Ott, Kerstin & Fischer, Helene
- Ott, Kerstin & Zucker, Ben
- Ott, Kerstin, Berg, Andrea
- Ott, Kerstin, Carpendale, Howard
- Ott, Kerstin, Fischer, Helene
- otta
- Ottaviani, Giuseppe
- Ottaviani, Giuseppe & Bender, April
- Ottaviani, Giuseppe & Burns, Christian
- Ottaviani, Giuseppe & Burton, Jan
- Ottaviani, Giuseppe & Cari
- Ottaviani, Giuseppe & England, Kyler
- Ottaviani, Giuseppe & Josef, Mila
- Ottaviani, Giuseppe & Lucid Blue
- Ottaviani, Giuseppe & Lumiere, Eric
- Ottaviani, Giuseppe & McTeague, Tricia
- Ottaviani, Giuseppe & O’Callaghan, John
- Ottaviani, Giuseppe & Rene, Jennifer
