The Chaldean Eparchy of Saint Thomas the Apostle in Detroit is a Chaldean Catholic Church eparchy of the Catholic Church in the Eastern United States. It practices the Syro-Oriental Rite in Classical Syriac. It is exempt, i.e. immediately subject to the Holy See, not part of any ecclesiastical province. Its cathedral episcopal see is Our Lady of Chaldeans Cathedral, located in Southfield, Michigan, United States.