Colonel Sir Ralph Stephenson Clarke, (17 August 1892 – 9 May 1970) was a British Conservative Party politician who served as Member of Parliament (MP) for East Grinstead from 1936 to 1955. He was elected to the House of Commons at a by-election in July 1936, after East Grinstead's Conservative MP Henry Cautley was ennobled as Baron Cautley. Clarke held the seat until he stood down at the 1955 general election. He was appointed as a Deputy Lieutenant (DL) of Sussex in 1932, and in the 1955 New Year Honours, he was made a Knight Commander of the Order of the British Empire (KBE), "for political and public services".

Family

Clarke was the son of Colonel Stephenson Clarke. He married Rebekah Mary Buxton, daughter of Gerald Buxton and Lucy Ethel Pease, on 15 December 1921, and they had three children. His wife was from the Pease family of Darlington; Lucy's father was Joseph Whitwell Pease and her maternal grandfather was Alfred Fox, who created Glendurgan Garden. The Stephenson Clarkes were the founders in 1730 of Stephenson Clarke Shipping, Britain's oldest shipping company. In 1892, Ralph Clarke's father purchased a 200 acre estate at Borde Hill, near Haywards Heath in West Sussex, and from about 1912 began collecting trees and shrubs began by financing plant-collecting expeditions to the Himalayas and China. Ralph Clarke took up residence there is 1949, after the death of his father, and opened the gardens to the public in 1965.