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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,'' although nearly all parishes in the AWRV celebrate only that of the ''Orthodox Missal''. The basis of the liturgy is the Tridentine Mass of 1570. It is also authorized for use within the Russian Orthodox Church Outside Russia (ROCOR). The [[Mass]], or Liturgy of St. Gregory the Great, has also been authorized for use by and celebrated within the Polish Orthodox Church, the Patriarchate of Moscow, the Russian Orthodox Church Outside Russia, and the Alexandrian Patriarchate.
==Structure of the Ordinary==