The Orthodox Church of Greece - Holy Synod in Resistance (SiR; ) was an Old Calendarist denomination.
The Holy Synod in Resistance was established in 1984.
The first Holy Synod President of the SiR is Metropolitan Cyprian of Oropos and Fili; he was elected to this position in 1985.
Metropolitan Cyprian of Oropos and Fili died in 2013. He was succeeded as president by Metropolitan (Cyprian II) of Oropos and Fili.
The SiR ceased to exist on March 18, 2014, when it merged into with the (a Greek Old Calendarists group) under the presidency of Archbishop Kallinikos of Athens.