A Retroquire (also spelled retro-choir or retrochoir) or Back-Choir, is a term in ecclesiastical architecture that defines the space behind the high altar in a church or cathedral, which sometimes separates it from the end chapel. It may sometimes contain seats for the church choir.

A Retroquire (also spelled retro-choir or retrochoir) or Back-Choir, is a term in ecclesiastical architecture that defines the space behind the high altar in a church or cathedral, which sometimes separates it from the end chapel. It may sometimes contain seats for the church choir.