Sir William à Beckett (28 July 1806 – 27 June 1869) was a British barrister and the first Chief Justice of the Supreme Court of Victoria.

In 1838 à Beckett, along with William Foster and Richard Windeyer, defended the 11 colonists charged with murder in relation to the Myall Creek massacre.

Politically conservative, à Beckett was strongly opposed to the social disruption caused by the Victorian Gold Rush and under the pseudonym 'Colonus' espoused his views in an influential pamphlet somewhat cumbersomely entitled Does the Discovery of Gold in Victoria Viewed in Relation to its Moral and Social Effects as Hitherto Developed Deserve to be Considered a National Blessing or a National Curse?

He presided over a number of important trials including the robbers of gold from the barque Nelson in Hobson's Bay in 1852, but growing disillusion with the state of society in Victoria saw him leave for England with his family in February 1853.

[9] A'Beckett Street, located in Melbourne's Central Business District, is named for Sir William and his influential role as Chief Justice of Victoria.