Sir Thomas Townsend Bucknill, PC (18 April 1845 – 4 October 1915) was an English judge of the Victorian and Edwardian eras, a Member of Parliament and a Privy Councillor.
'Tommy' Bucknill was born at Exminster in 1845, the second son of Sir John Charles Bucknill, a famous asylum doctor and psychiatrist who was knighted in 1894 in recognition of his services as one of the founders of the Volunteer Movement. Thomas Bucknill was educated at Westminster School and afterwards at Geneva. He was called to the bar in 1868, became a Queen's Counsel in 1885, and a bencher of the Inner Temple in 1891. From 1885 to 1899 he was Recorder of Exeter. He edited The Cunningham Reports and Sir S. Cook's Common Pleas Reports, and was a leading Counsel on the Admiralty Circuit and on the Western Circuit. He sat as the Conservative Member of Parliament for Epsom from 1892 to 1899, in which year he was raised to the bench, succeeding Sir Henry Hawkins, and was knighted. In 1914 he was appointed a Privy Councillor.