|Second Council of Dvin|
|Accepted by||Armenian Apostolic Church|
|First Council of Dvin|
|Third Council of Dvin|
|Convoked by||Nerses II of Bagrevand|
|Chronological list of ecumenical councils|
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The Second Council of Dvin was a church Synod or ecumenical Council held in 554 in the city of Dvin (then in Sasanian Armenia).
The Second Council of Dvin was called by Catholicos Nerses II of Bagrevand, and the bishops declined to accept the canons of Chalcedon. This was significant as it was the moment where the Armenian church declined to accept the dyophysite formula that had been adopted by the majority of Christendom at the Council of Chalcedon. This decision was made because of the Armenians' observation that the decrees of Chalcedon had caused the doctrine of Nestorius to spread.
This rejection marks the point of separation between the Armenian Apostolic Church and Oriental Orthodoxy more generally from Ecumenical Patriarchate of Constantinople  (the Eastern Orthodox Church and Roman Catholic Church were still united).
The Council adopted 87 canons and marks the beginning of the Armenian Church Calendar. It also established various administration and conduct rules and regulations for members of the Armenian Church.
The Armenian Apostolic Church formally became autocephalous - i.e. independent of external authority - in 554 by severing its links with the patriarchate of Constantinople.