Klaus Felix von Amsberg (Klaus Felix Friedrich Leopold Gabriel Archim Julius August von Amsberg; 1 September 1890 – 19 December 1953) was a member of the German Niederer Adel (lower nobility) and father of Prince Claus of the Netherlands, who was the father of King Willem-Alexander of the Netherlands, thus making him the paternal grandfather of the current Dutch monarch.
He was born at Rehna, Mecklenburg-Schwerin, German Empire (now Mecklenburg-Vorpommern, Germany), the first child of Wilhelm von Amsberg (1856–1929), by his marriage to Elise von Vieregg (1866–1951), member of an old aristocratic family.
In World War I he fought as a German officer in the Imperial German Army at the side of General Paul von Lettow-Vorbeck in German East Africa.
Claus was from 1917 the steward of an estate after a failed venture in Africa as a planter.
In 1928 he moved with his family to the Tanganyika Territory (now Tanzania), where he remained during the outbreak of World War II