The diocese of Ammonia () is a suppressed and titular see of the Roman Catholic Church.Annuario Pontificio 2013 (Libreria Editrice Vaticana, 2013 ), "Sedi titolari", pp. 819-1013 It is all that remains of the ancient bishopric that was centered the Siwa Oasis during late antiquity,Diocese of Ammoniace, at www.gcatholic.org when it was in the Roman province of Marmarica and suffraged by the archdiocese of Darni. Today Ammoniace survives as a titular bishopric and has been vacant since January 24, 1983.David Cheney, Diocese of Ammoniace, at Catholic-Hierarchy.org.
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