William Handcock Viscount Castlemaine (1st)
- Born: 28 Aug 1761
- Marriage: Lady Florinda Trench Viscountess Castlemaine on 20 Mar 1782
- Died: 7 Jan 1839 aged 77
 Noted events in his life were:
• Title: Baron Castlemaine (1st), 21 Dec 1812. Special remainder on the "failing heirs of his body to his brother". ie If he failed to have heirs the title would pass to his brother. This happened.
William married Lady Florinda Trench Viscountess Castlemaine, daughter of William Power Keating Trench Earl of Clancarty (1st) and Anne Gardiner, on 20 Mar 1782. (Lady Florinda Trench Viscountess Castlemaine was born on 3 Aug 1766 in Twyford, Westmeath, Ireland and died on 9 Feb 1851.)
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