Felix de Andreis (May 1, 1778 – October 15, 1820) was the first superior of the Congregation of the Mission (Lazarists) in the United States and Vicar-General of upper Louisiana in St. Louis.
Andreis was born in northern Italy. His early theology teaching career was at the College of the Propaganda in Rome, a school that trained priests for mission work. Louis Dubourg recruited Andres in 1815 to work in the Missouri Territory. He arrived in St. Louis in 1817. Appointed Vicar-General by Dubourg, Andreis also directed several educational and spiritual endeavors, including acting as spiritual director of Rose Philippine Duchesne.
Theologians approved Andreis's spiritual writings on April 15, 1917, and the cause for his beatification was formally opened on July 25, 1918, granting him the title of Servant of God.