Leopold Karl von Kollonitsch (also spelt Collonicz, Colonitz, Kollonitz, Kolonits and Kolonić; 26 October 1631 – 20 January 1707) or Lipót Kollonich was a cardinal of the Holy Roman Church, Archbishop of Kalocsa and later of Esztergom, and Primate of Hungary.

[1] In 1683, at the time of the second Siege of Vienna by the Turks, Kollonitsch went to the city, taking money to pay troops and also establishing emergency hospitals in monasteries there.

After the Battle of Kahlenberg on 11 and 12 September 1683 which lifted the siege, he organized the care of some five hundred orphans at Schloss Mailberg, children whose parents had been killed in the conflict.

[1] In 1685, Kollonitsch was appointed Bishop of Győr, in Hungary, and gave up his diocese in Austria, where he was succeeded by Cristoval Royas de Spinola.

[3] In 1692 the Emperor Charles VI made him Minister of State, and in that capacity Kollonitsch was responsible for reorganizing the new Hungarian territories conquered from the Ottoman Empire.

[4] The Emperor never acted on the Cardinal archbishop's appeal for measures to bring about a massive conversion to Rome, but a document he issued in 1691 known as the Explanatio Leopoldina suggested that religious freedom in the conquered lands was to be only temporary.