- O&G
- O-Town
- O-Zone
- Oana
- Oana & Reykon
- OASEZ
- OB1
- Obernik, Dada & Harris
- OBK
- OBS
- Ocean Drive
- Oceana
- OceanLab
- Oceans
- Odd Mob
- Oden & Fatzo
- Odysseus
- Ofenbach
- Ofenbach & Lack of Afro
- OFFAIAH
- Offboy
- Ogün Dalka & Melike Konur
- Ogün Dalka, DJ Funky C & Serena
- Oh Snap! & Bombs Away
- Oh Snap!!
- OK_MA & Relups
- Ol Skool Nu Skool
- Olav Basoski
- Olav Basoski & Mitchie One
- Olga
- Olga Scheps
- OLI Milne
- OLI Milne & Addal
- Olive
- Oliver $ & Jimi Jules
- Oliver Gunning
- Oliver Heldens
- Oliver Heldens & Becky Hill
- Oliver Huntemann
- Oliver Ingrosso & Adam Avant
- Oliver Koletzki
- Oliver Moldan
- Oliver Nelson & Milkwish
- Oliver Nelson & Tobtok
- Olly Wall
- Olympis, Draze & Esther
- Olá
- Omega Cobra
- Omer Netzer
- Omi
- Ommy Dimpoz
- Omnikid
- Ondina
- One Bit & Laura White
- One Bit & Louisa
- One Bit & Louisa Johnson
- One Bit & Noah Cyrus
- One Greene
- One-T
- One-Two
- ONF
- Onipa
- Only U
- OnlyOneOf
- Onni Boi
- ONUKA
- Onur Betin & Mert Hakan
- OnyxOculus
- OOVEE & Flatdisk
- Ophélie Winter
- OPOLOPO & ANDREA CLARKE
- Ora Mate
- Orange Grove
- Orange Juice
- Orbital
- Orchestral Manoeuvres In the Dark
- Orenda
- Orezi
- Orgy
- Origene
- Oriska
- Orkidea
- Oryane
- Oscar Loya
- Oscar Martinez
- Oscar Mbo
- Oscar Repo
- Oscar the Punk
- Oscu
- OSKIDO
- OSKIDO & DJ Steve
- OSKIDO & Sdudla Somdantso
- Osrin & Wilhelm
- Ostblockschlampen
- OtherView & Chris Willis
- Otilia
- Otogohan Project
- Otosan & Shadow Child
- OTR
- OTR & Au/Ra
- OTR & Panama
- OTR & Ukiyo
- Otto Knows
- Ou Est Le Swimming Pool
- Out of Office
- Outbreak
- Outlander
- Outrowz
- Outsiders
- Outsiders & Jebroer
- Outsiders, Jebroer & The Darkraver
- Outwork
- Outwork featuring Mr. Gee
- OV
- Oxide & Neutrino
- Oyo
- Ozark Henry