Sir William Henry Clark GCMG KCSI (4 January 1876 – 22 November 1952) was a British civil servant and diplomat.
[citation needed] Clark began his career as a clerk at the Board of Trade in 1899.
Clark was also the Member for Commerce and Industry of the Council of the Viceroy of India, 1910–1916; Comptroller-General, Commercial Intelligence Department of Board of Trade, 1916–1917; Comptroller-General of Department of Overseas Trade, 1917–1928.
From 1934 to 1939 he was British High Commissioner for Basutoland, Bechuanaland Protectorate, Swaziland, and the Union of South Africa.
He is buried in the Parish of the Ascension Burial Ground in Cambridge, with his wife Lady Clark, née Anne Monsell (22 February 1880 – 11 November 1946), former wife of W. Bennett Pike.