The House of Walderdorff is the name of an old and distinguished German noble family, whose members occupied many important ecclesiastical positions within the Holy Roman Empire.

In the 20th century one branch originally from Wiesbaden settled in the United States of which Tessa Gräfin von Walderdorf is an offspring.

First mentioned in 1198, the Walderdorff family belongs to the Uradel of the Rhineland and has strong historic ties to the Catholic Church.

Since 1657 the family's ancestral seat has been Molsberg Castle in Westerwaldkreis, Rhineland-Palatinate.

Today, the family also resides in Schloss Höfling, Regensburg, Bavaria, leased to them in 1985 for one hundred years by its owners, members of the House of Thurn und Taxis.