Philipp Franz Wilderich Nepomuk (2 March 1739 – 21 April 1810) was count of Walderdorf and the last prince-bishop of Speyer.

It was unusual that during the secularization, Wilderich was able to live in the south wing of his official residence, the baroque palace in Bruchsal, until his death in 1810.

On 22 April 1797, following the death of his predecessor August Philip of Limburg Stirum, Walderich, who was at that time the Domdechant of Trier, was installed as lord bishop of Speyer.

He was granted a pension of 200,000 florins and the right of residence in the Waghäusel Hermitage; in winter he could continue to live in a part of the former episcopal palace.

From 1806 onward he lived next to the recently widowed Grand Duchess Amalie von Baden, who took up residence in the northern part of the palace.