The Chaldean Eparchy of Saint Thomas the Apostle in Detroit (Latin: Eparchia Sancti Thomas Apostoli Detroitensis Chaldaeorum) is a Chaldean Catholic Church eparchy of the Catholic Church in the Eastern United States.

It is exempt, i.e. immediately subject to the Holy See, not part of any ecclesiastical province.

It was created by Pope John Paul II on January 11, 1982, as the Apostolic Exarchate of United States of America for the Chaldeans,[2] covering the entire United States.

It was elevated to an eparchy, an Eastern-rite Catholic diocese, led by an eparch (bishop) on August 3, 1985.

[3] On 21 May 2002 it lost vast territory to establish the Chaldean Catholic Eparchy of Saint Peter the Apostle of San Diego.