Effective period / Period of releases: 1993 - 2004

Urmas Sisask (born 9 October 1960, Rapla, Estonia - died 17 December 2022) was an Estonian composer. He studied composition under René Eespere and graduated from the Tallinn Conservatory in 1985.

One of the most influential Estonian composers along with Arvo Pärt and Erkki-Sven Tüür, he composed many sacred music works such as Gloria Patri and Magnificat. His work was influenced by astronomy, the solar system and Gregorian chant. Brother of the singer and politician Siiri Sisask.