Sir William Frederick Haynes-Smith (26 June 1839 – 18 December 1928) was an English colonial administrator in the British Empire.Haynes-Smith was born in Blackheath, Kent, the fourth son of John Lucie Smith, of Georgetown, Demerara.
He was called to the Bar by the Middle Temple in 1863, and shortly after was sent to British Guiana as Solicitor-General.
In 1874, he was appointed Attorney-General.
A decade later, he served as acting Governor for a few months, which he also did 1887.
In November 1888, he was appointed Governor of the Leeward Islands, followed by a transfer to the Bahamas in 1895.
He served as High Commissioner of Cyprus from 1898 to 1904.He was appointed a Companion of the Order of St Michael and St George in 1887, and knighted in the same order in 1890.His daughter Anne married Rear Admiral Edward Cecil Villiers and was the mother of Vice Admiral Sir Michael Villiers.He died at Turleigh Mill in Bradford-on-Avon, Wiltshire.