Lothar Franz von Schönborn-Buchheim (4 October 1655 – 30 January 1729) was the Archbishop-Elector of Mainz from 1694 to 1729 and the Bishop of Bamberg from 1693 to 1729.
As Archbishop of Mainz, he was also Archchancellor of the Holy Roman Empire.
Lothar Franz von Schönborn is known for commissioning a number of Baroque buildings, such as the palace Schloss Weissenstein.