The House of Keyserlingk (Keyserling) is the name of an old and influential German noble family from Westphalia, whose members held significant positions in Prussia, Saxony, Baltic and Russia.

The direct line began with Albert Keserlink (mentioned 1443–1467), mayor at Herford.

In Prussia, the Russian Empire and the Electorate of Saxony his descendants worked for the state and in the 18th century four of them gained the title of Graf.

There are a number of interesting articles on Keyserling(k) as well as an extensive bibliography on the family website.

Count Hermann Carl von Keyserlingk (1696–1764), a Russian ambassador to Saxony, helped Johann Sebastian Bach get the title Court composer to the King of Poland and the Elector of Saxony, received from Elector Frederick Augustus II in 1736.