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'''The Divine Liturgy of St. Gregory the Great''' is one of the liturgies authorized for use by the [[AOCA|Antiochian]] [[Western Rite Vicariate]] (AWRV). It is authorized for use in the AWRV in two forms—that of the ''Orthodox Missal'' and that of the ''Saint Andrew's Service Book''. The basis of the liturgy is the
Tridentine Mass (1570) of the Roman Catholic Church. It is also authorized for use within the Russian Orthodox Church Outside Russia (ROCOR). In the past, a form of the Tridentine Mass has been celebrated by the Polish Orthodox Church, the Patriarchate of Moscow, and the Alexandrian Patriarchate.
==Structure of the Ordinary==