William Handcock, 1st Viscount Castlemaine

William Handcock, 1st Viscount Castlemaine, PC (Ire) (28 August 1761 – 7 January 1839) was an Irish MP and a supporter of the union of Ireland with Great Britain.

In 1783, Handcock stood for Athlone in the Irish House of Commons and represented the constituency until the Acts of Union in 1801.

[1] The Australian city of Castlemaine in the state of Victoria was named in his honour by his nephew Captain W. Wright.

On 20 March 1782 he married Lady Florinda Trench (3 August 1766 – 9 February 1851), born in Twyford, Westmeath to William Power Keating Trench, 1st Earl of Clancarty and Anne Gardiner, Countess of Clancarty.

William and Florinda had no children,[2] and when Handcock was created Baron Castlemaine, of Moydrum (in the Peerage of Ireland) on 21 December 1812 the title had a special remainder "failing heirs of his body to his brother".