- Oathbreaker
- Obscura
- Obsidian Echoes
- Ocean Grove
- Ocean in Concert
- Ochmoneks
- Odeal
- Of Curious Nature
- Of Virtue
- OG Keemo
- OG LU
- Oh Voyage
- Oh Wonder
- Ohne Rolf
- Ohnsorg Theater
- Ohrenfeindt
- Ohrenpost
- Oi! The Pott Festival
- OK KID
- Okan Seese
- Olaf Bossi
- Olaf der Flipper
- Olaf Schubert
- Ole Lehmann
- Olga Myko
- Olga Paschtschenko
- Oliver Kalkofe
- Oliver Polak
- Oliver Rohrbeck
- Oliver Steinhoff
- Oliver Steller
- Oliver Wnuk
- Olli Dittrich
- Olli Schulz
- Omar Rudberg
- Omar76
- OMD
- Omer Klein
- Omnium Gatherum
- One Eye Open
- One Night of Dire Straits
- ONE OF THESE - a celebration of Pink Floyd
- One Step Closer - A Tribute to Linkin Park
- OneRepublic
- ONKeL fISCH
- Only The Poets
- Onslaught
- Onyx
- Opeth
- Opus Kink
- Ora Cogan
- Orange Blue
- Orange Sector
- orbit
- Orbit Culture
- Orchestre National de France
- Orchestre Philharmonique de Radio France
- Orchestre Philharmonique Royal de Liege
- Orden Ogan
- Original Koffee
- Orion Orchestra
- Orthodox
- OsamaSon
- Osan Yaran
- Oscar Lindsey
- Oskar Haag
- Oskar med K
- Oswald
- Ottolien
- Our Mirage
- Our Promise
- Out of Vision
- Over The Border Festival
- Overhead
- Overpass
- Oversize
- Oxo 86
- Özcan Cosar
- Özgür Cebe
- Ozzyfied