Patriarch Filaret (secular name Mykhailo Antonovych Denysenko Михайло Антонович Денисенко, born 23 January 1929) is a Ukrainian religious leader, currently serving as the primate and Patriarch of the Ukrainian Orthodox Church – Kyiv Patriarchate. The Orthodox Church of Ukraine, that he left in 2019, views him as the Honorary Patriarch emeritus, while the Ecumenical Patriarchate of Constantinople recognises him as former Metropolitan of Kyiv.

He was formerly the Metropolitan of Kiev and the Exarch of Ukraine in the Patriarchate of Moscow (1966–1992). After joining the Kyiv Patriarchate, he was defrocked and in 1997 excommunicated by the ROC. On 11 October 2018, the Patriarchate of Constantinople reinstated him in church communion. However, while restored to the episcopate, the Ecumenical Patriarchate never recognised him as Patriarch and views him as the former Metropolitan of Kyiv. On 15 December 2018, the Ukrainian Orthodox Church of the Kyiv Patriarchate united with the Ukrainian Autocephalous Orthodox Church and some members of the Ukrainian Orthodox Church (MP) into the Orthodox Church of Ukraine; the Ukrainian Orthodox Church of the Kyiv Patriarchate thus ceased to exist.

Mykhailo Denysenko was born on 23 January 1929, into a worker's family in the village of Blahodatne in the Amvrosiivsky Raion (district), now in the Donetsk Oblast (province) in Eastern Ukraine. His parents were Anton and Melania Denysenko. He obtained his theological education at the Odesa Seminary (Moscow Patriarchate) and the Moscow Theological Academy where he became a close associate of Patriarch Alexius I of Moscow. He took monastic vows in 1950 assuming the monastic name Filaret and was ordained hierodeacon in January 1950 and priest in June 1951. After his graduation he stayed at the Moscow Theological Academy as a professor (from 1952) and Senior Assistant to the Academy inspector. In 1956 he was appointed Inspector of the Theological Seminary in Saratov and elevated to the rank of hegumen. In 1957 he was appointed Inspector of the Kyiv Theological Seminary. In July 1958 he was further elevated to the rank of Archimandrite and appointed seminary rector.

In 1961, Filaret served in the mission of the Russian Orthodox Church (ROC) to the Greek Orthodox Patriarchate of Alexandria. In January 1962 Filaret was elected vicar Bishop of the Leningrad Eparchy and, in February, was ordained bishop in Leningrad by Metropolitan Pimen (later Moscow Patriarch) and other bishops. Filaret was appointed to several diplomatic missions of the Russian Orthodox Church and from 1962 to 1964 served as ROC Bishop of Vienna and Austria. In 1964 he returned to Moscow as the Bishop of Dmitrov and rector of the Moscow Theological Academy and Seminary.

In 1966, he became archbishop of Kyiv and Halych, thus becoming one of the most influential hierarchs in the Russian Orthodox Church, where the office of the Kyiv Metropolitan is highly regarded. At that time he also became a permanent member of the Holy Synod, the highest collegiate body of the Russian Orthodox Church, which has the responsibility of electing the Moscow Patriarch. In 1968 Filaret became Metropolitan of Kyiv and Galicia.

As late as October 1989, Filaret was still saying, "The Uniates will never be legalized in our country."

On May 3, 1990, Patriarch Pimen of Moscow died and, the same day, Filaret became the locum tenens of the Russian Orthodox Church. Filaret was not elected Patriarch of Moscow. Retrospectively, in 2019, Filaret declared "it was not by chance that I was not elected. The Lord prepared me for Ukraine"

On 27 October 1990, in a ceremony at St. Sophia Cathedral in Kyiv, the newly elected Patriarch Alexei II handed to Metropolitan Filaret a tomos granting "independence in self government" (the tomos did not use either of the words "autonomy" or "autocephaly") to Metropolitan Filaret, and enthroned Filaret, heretofore "Metropolitan of Kyiv", as "Metropolitan of Kyiv and All-Ukraine".