- Oficina G3 (Braziliam Christian Band)
- OFK (We are OFK)
- OfMan, Lewis
- Ofner, Dominik (Austrian Singer, Band, Folk, Pop)
- Oforia
- Ofrin (Israeli singer based in Berlin, Germany and Tel Aviv, Israel)
- OG Buda feat. lil krystalll
- OG Hindu Kush
- OG Keemo (German rapper)
- OG Keemo & Kwam.E
- Og Kush Salamanda (Lazy Lizzard Gang member)
- OG Maco
- OG Prince (Russian rapper)
- OG Ron C (Texas-based Swishahouse member & screw DJ Ronald Coleman)
- OG Semi‐Auto (US rapper)
- Ogada, Ayub
- Ogando, Gabriel
- Ogata, Megumi
- Ogawa, Michiko, Trio, The
- Ogawa, Noriko (pianist)
- OGB
- Ogbert the Nerd
- Ogbon, Lord Jah-Monte (US rapper a.k.a. Jah-Monte)
- Ogden Edsl
- Ogden, Craig (guitarist)
- Ogden, Jonathan
- Ogdon, John (pianist and composer)
- Ogeday
- Ogee (French singer‐songwriter)
- Ogemaw County (Detroit, Michigan based metalcore act)
- Ogen
- Ogeret, Marc
- Ogfrankie
- Oghre (Metal band from Rīga, Latvia)
- OGI
- Ogikubo Station
- Ogilvie, George
- Oginome, Yoko (Pop idol, actress & voice actress)
- OGK4Lyf
- Ognevich, Zlata
- Ogre (Stoner group from Raymond, ME, United States)
- OGRE (Composer & sound designer from UK, Robin Ogden)
- OGRE Sounds
- Ogre You Asshole
- Ogres de Barback, Les
- Ogres de Barback, Les & Fanfare du Belgistan, La
- Ogres de Barback, Les & Hurlements d'Léo, Les
- Ogres de Barback, Les feat. Lacaille, René, Oriane Lacaille, Lacaille, Marco & Ogrillons, Les
- Ogres de Barback, Les feat. Lo'Jo & Eyo'nlé, Fanfare
- Ogres de Barback, Les feat. Marco
- Ogres de Barback, Les feat. Perret, Pierre
- Ogres de Barback, Les feat. Polo
- Ogres de Barback, Les feat. Têtes Raides
- Ogün, Buddy (German Artist)
- Oğur, Erkan
- Oğur, Erkan & Demircioğlu, İsmail Hakkı
- Oğur, Erkan & Demircioğlu, İsmail Hakkı
- Oğur, Erkan & Gasparyan, Djivan
- Oğur, Erkan & Öztürk, Okan Murat
- Ogura, Yui (Japanese actress, voice actress & singer)
- Oguretz, DJ
- Oğuzhan Koçalan
- OGXO
- Oh Astro
- Oh Bummer!
- Oh Chill (South Korea)
- Oh Darling
- oh gasm!
- Oh Geeez
- Oh Hello's, The
- Oh Hellos, The
- Oh Hiroshima
- Oh Honey
- Oh Jeremiah
- Oh La La ! (french band)
- Oh Land
- Oh Land feat. Turboweekend
- Oh Laura
- Oh Maria
- Oh Mercy
- OH MY GIRL
- oh my god
- Oh My! (Leeds pop duo)
- Oh My! (Swedish indie pop band)
- Oh No
- Oh No feat. Blacc, Aloe
- Oh No feat. Epps, Stacy
- Oh No feat. Frank-N-Dank
- Oh No feat. LMNO
- Oh No feat. MF DOOM
