Philipp Karl von Eltz-Kempenich (26 October 1665 – 21 March 1743) was Archbishop-Elector of Mainz from 1732 to 1743.

[1] Philipp Karl von Eltz-Kempenich was born at Burg Eltz on 26 October 1665.

In 1733, shortly after he became archbishop, the War of the Polish Succession began, pitting the Kingdom of France against the Habsburg monarchy.

Philipp Karl von Eltz-Kempenich allied the Archbishopric of Mainz with the Habsburgs in this conflict.

The majority of fighting in this conflict took place in the Rhineland, leading the archbishop reluctantly to order the fortification of Mainz.