- Original Nielsen Brothers
- Orishas
- Original Alpenland Quintett
- Original 4 Tiroler Buam
- Origin
- Original (German) Cast Of "Tanz der Vampire"
- Origa
- Orikasa Ai
- Original (German) Cast of "Starlight Express"
- Original Tiroler Echo
- Originoo Gunn Clappaz
- Original Ensemble vom "Broadway Musical im Hamburger Hafen"
- Orishas -
- Orianthi
- Orietta Berti
- Orion Too
- Orinda Huta
- Original Maintaler
- Orishas + HeatherHeadley
- Origene
- Orion
- Orioles
- Original German Cast of Joseph and the Amazing Technicolor Dreamcoat
- Original 3
- Original Gamsbart Trio
- Original U.S.A. Gospel Choir
- Orion Riders
- Origen
- Original Concept
- Original Stock
- Original Latin All Stars
- Original Flavor
- Original Sin
- Orielle
- oriori
- Orient Expressions
- Oriental Sunshine
- Original Dixieland Jazz Band
- Orient Pearl
- Orion Weiss
- Original Casuals
- Original Mirrors
- Origin Unknown
- ORIGINAL LOVE
- Oriental ST8
- Orion the Hunter