Orientalis Ecclesiae (English: Of the Eastern Church) is an encyclical issued by Pope Pius XII on 9 April 1944. It celebrates the life and work of St. Cyril, Patriarch of Alexandria on the occasion of the fifteenth centenary of his death.

Orientalis ecclesiae
Latin for 'Of the Eastern Church'
Encyclical of Pope Pius XII
Coat of arms of Pope Pius XII
Signature date 9 April 1944
SubjectOn St. Cyril, Patriarch of Alexandria
Number6 of 41 of the pontificate
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