Triosphere is a Norwegian progressive heavy metal band from Trondheim, Norway.
The band was formed as a trio in 2004. After the release of their first EP Deadly Decadence the following year, they released in 2006 their debut album Onwards Shortly after the release the band was expanded from a trio to a quartet when live guitarist Tor Ole Byberg joigned as full-time member. They subsequently toured with various bands including W.A.S.P., Kamelot and Arch Enemy. In 2010 their second album, The Road Less Travelled, was released. Following their 2011 tour with Sonata Arctica and their 2012 tour with Kamelot, a third album is planned.