Pope Francis and Patriarch Kirill sign an Ecumenical Declaration in the first such meeting between leaders of the Catholic and Russian Orthodox Churches since their split in 1054.

Pope Francis was head of the Catholic Church and sovereign of the Vatican City State from 13 March 2013 until his death in 2025. He was the first Jesuit pope, the first Latin American, and the first born or raised outside Europe since the 8th-century Syrian pope Gregory III.

Kirill or Cyril is a Russian Orthodox bishop. He became Patriarch of Moscow and all Rus' and Primate of the Russian Orthodox Church on 1 February 2009.

The Joint Declaration of Pope Francis and Patriarch Kirill, also known as the Havana Declaration, was issued following the first meeting in February 2016 between Pope Francis, who, as the Bishop of Rome, was the pontiff of the Catholic Church, and Patriarch Kirill of Moscow, Patriarch of Moscow and all Rus', Patriarch of the Russian Orthodox Church (ROC), the largest of the Eastern Orthodox churches. This was the first time leaders of the Catholic Church and the Moscow Patriarchate had met. While the meeting was also seen as a symbolic moment in the history of relations between the Catholic Church and the Orthodox churches as a community, which had split in the Great Schism of 1054, centuries before the Moscow Patriarchate was constituted, it was not expected to lead to any immediate rapprochement between them.

The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institutions and has played a prominent role in the history and development of Western civilization. The Church consists of 24 sui iuris (autonomous) churches, including the Latin Church and 23 Eastern Catholic Churches, which comprise almost 3,500 dioceses and eparchies around the world, each overseen by one or more bishops. The pope, who is the bishop of Rome, is the chief pastor of the church.