William Digby, 5th Baron Digby (20 February 1661 – 27 November 1752) was an English peer and politician.
Digby was a younger son of Kildare Digby, 2nd Baron Digby, and Mary Gardiner. He matriculated at Magdalen College, Oxford on 16 May 1679, and received a BA in 1681. 
In 1686 he succeeded his elder brother as fifth Baron Digby.  This was an Irish peerage and did not entitle him to a seat in the English House of Lords. He was instead elected to the House of Commons for Warwick in 1689, a constituency he continued to represent until 1698. In September 1698, he inherited the estate of Sherborne Castle from his third cousin once removed, John Digby, 3rd Earl of Bristol.
In 1708, Digby was awarded a DCL from Oxford.  He died in November 1752, aged 91, and was succeeded in the barony by his grandson Edward Digby, his son the Hon. Edward Digby having predeceased him.
Lord Digby married Lady Jane Noel (c. 1664 – 10 September 1733), daughter of Edward Noel, 1st Earl of Gainsborough, in 1686. They had four sons and eight daughters: 
Simon Harcourt, 1st Viscount Harcourt, PC of Stanton Harcourt, Oxfordshire, was an English Tory politician who sat in the English and British House of Commons from 1690 until 1710. He was raised to the peerage as Baron Harcourt in 1711 and sat in the House of Lords, becoming Queen Anne's Lord High Chancellor of Great Britain. He was her solicitor-general and her commissioner for arranging the union with Scotland. He took part in the negotiations preceding the Peace of Utrecht.
Baron Digby is a title that has been created twice, once in the Peerage of Ireland and once in the Peerage of Great Britain, for members of the same family.
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