Trondheim Jazz Orchestra (TJO) (established 1999 in Trondheim, Norway) is an orchestral project based in Trondheim, and closely related to both the Midtnorsk Jazzsenter (MNJ - Mid Norwegian Jazz Center) and Jazz Line at the Trøndelag Conservatory of Music (NTNU). During the 1990s the orchestra was a plain conservatory-band (Konsen Big Band). In 2000 the name of the band was changed to TJO. An important feature with Trondheim Jazz Orchestra is the band's flexible and varying size crew. The orchestra works on a project basis and performs mainly commissioned works of selected composers.