- Oath, The (German heavy doom metal)
- Oathbreaker (Belgian post-black metal band)
- Oathless
- Oaths, The
- Oatmello
- Oattes, Bernard
- Oaty. (lo‐fi artist)
- OAU (OVERGROUND ACOUSTIC UNDERGROUND)
- OB (DnB Producer (North London))
- OB OBrien feat. Drake & Preme
- Oba Oba Samba House
- Obadiah Parker
- Obake
- Öbarna
- Obas, Beethova
- Obata, Takahiro (jazz pianist, keyboardist)
- OBB (Oswald Brothers Band)
- Obbie Messakh (Artist of JK Records)
- Obe Dve
- Obè, Amir
- Obè, Amir feat. PARTYNEXTDOOR
- Obè, Amir feat. Sostre, Eli
- Obed Marsh (Australian black/doom metal)
- Obel, Agnes (Danish singer)
- Oben, Cahit
- Obenski, Amy
- Oberbaum (German/Belgian artist Lucie Rezsöhazy)
- Oberer Totpunkt
- Oberhofer
- Oberlin, Karen
- Oberpichler, Rale
- Oberritter Dóra ft. Lotfi, Begi
- Oberschlesien
- Oberst, Conor
- Oberst, Conor and Mystic Valley Band, The
- Obese Turtles, The (Kimya Dawson side project)
- Obeses
- Obey the Brave
- Obey, Ebenezer
- OBGMs, The
- Obi (UK britpop band)
- Obi Best (formerly called Colorforms)
- Obia le Chef
- Obia le Chef avec Caballero & JeanJass
- Obia le Chef feat. Tizzo
- Obiat
- Obibox
- Obie Hans
- Obiedo, Ray
- Obieglo, Andreas
- Obispo, Pascal
- Obispo, Pascal & Alexia Gredy
- Obispo, Pascal & Angi, Giordana
- Obispo, Pascal & Frégé, Élodie
- Obispo, Pascal & Mars, Mélissa
- Obispo, Pascal & St-Pier, Natasha
- Obispo, Pascal avec Zazie
- Obispo, Pascal feat. Baby Bash
- Obispo, Pascal feat. Calogero
- Obispo, Pascal feat. Casal, Luz
- Obispo, Pascal feat. Christophe
- Obispo, Pascal feat. Hallyday, Johnny
- Obispo, Pascal feat. La Troupe des Dix Commandements
- Obispo, Pascal feat. N'Dour, Youssou
- Obispo, Pascal feat. N’Dour, Youssou
- Obispo, Pascal feat. Pagny, Florent
- Obispo, Pascal feat. Stoner, Sam
- Obispo, Pascal feat. Zazie
- Obispo, Pascal, Willem, Christophe, Fiori, Patrick, Alizée
- Obito
- Obits
- Obituary (US death metal band)
- Objekt (TJ Hertz)
- Objektif
- Objetivo Birmania
- OBK
- OBLADAET (Russian rapper)
- Obladaun (Russian parody rap)
- Obligaatiot
- Obligatorisk Tortyr
- Oblio (Alt-rock trio based in Pasadena California)
- Oblique (New Wave/Electronic)
- Oblique (Bangladeshi band)
- Oblique Brown
- Obliterate (Canadian deathcore)
- Obliterations
- Oblivia (Australian band)
- Oblivians
- Oblivion (Chicago punk band)
- Oblivion (Blackened Technical Death Metal from the Bay Area)
