"Messe I.X-VI.X" is a studio album by the Norwegian experimental collective Ulver and the Tromsø Chamber Orchestra with additional aid from composer Martin Romberg. Written and produced by Ulver, released on October 8, 2013, via Jester Records and Kscope. The album has been described as a "peace mass for Lebanon".
Upon its release, Messe I.X–VI.X received positive reviews from music critics. Alex Franquelli, writing for The Quietus described the album as "a challenging work and an album of rare beauty.". Jamie Twort, writing for SputnikMusic rated the album 4.5/5, describing Messe I.X–VI.X as "a phenomenal album, combining intense atmosphere with the sort of cinematic sense of drama akin to some of the most powerful film scores." Gregory Burkart, writing for Fear.net described Messe I.X–VI.X as "one of the band's most surreal and haunting projects to date.