Constantius II of Constantinople (Greek: Κωνστάντιος; 1780 – 17 June 1859) served as Ecumenical Patriarch of Constantinople during the period 1834–1835.
Before his election as Ecumenical Patriarch on 18 August 1834, he had been Metropolitan bishop of Veliko Tarnovo.
He retired to Arnavutköy on the Bosphorus, where he died on 17 June 1859.
He was buried in the forecourt of the Holy Church of Asomatoi in Arnavutköy.
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