Antony IV of Constantinople (Greek:Ἀντώνιος; died May 1397) was theEcumenical Patriarch of Constantinople for two terms, from January 1389 to July 1390, and again fromc. September 1390 until his death.

He was originally ahieromonk, possibly from theDionysiou monastery inMount Athos. He was deposed during the usurpation ofJohn VII Palaiologos in July 1390, and replaced byMacarius of Constantinople, who had already served in the office in 1377–1379. After the restoration ofJohn V Palaiologos andManuel II Palaiologos a few months later, he was restored to his post.

He is notable for his correspondence withWładysław II Jagiełło,Grand Duke of Lithuania, urging him to join in acrusade against theTurks along with theHungarians, and withVasily I of Moscow, to whom he defended not only the universal spiritual authority of the Constantinopolitan patriarchate, but also the universal authority of theByzantine emperors, regardless of the actual diminished state of theByzantine Empire.

• Kazhdan, Alexander (1991),Oxford Dictionary of Byzantium,Oxford University Press, p. 125,ISBN 978-0-19-504652-6.

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