Captain William Spencer Beaumont (29 May 1848[1] – 2 August 1926) was a British army officer and a member of the London County Council.
Beaumont was the grandson of John Thomas Barber Beaumont, who raised the Queen Victoria's Rifles in 1803 during the Napoleonic Wars.[2] His parents were John Augustus Beaumont and Caroline Mary Beaumont, who owned Wimbledon Park.[1][3] Beaumont served as a captain in the 14th King's Hussars cavalry regiment in the British Army.[4] In 1876, he married Honoria Cooper.[3][4] In 1889 he was an elected a member of the London County Council to represent Tower Hamlets, Stepney. In 1890, Beaumont petitioned Ecclesiastical Commissioners for a Church site.[5]
Beaumont was the father of Dudley Beaumont (1874–1918), who married Sibyl Collings, later Dame of Sark.[4] His grandson was Francis William Beaumont (1903–1941) and his great-great-grandson is the 23rd Seigneur of Sark, Christopher Beaumont.