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.
- Hon. John Digby (c. 1687 – 18 March 1746) He matriculated at Magdalen College, Oxford on 10 September 1703 and received his MA on 8 May 1707. On 11 April 1715, his father petitioned the House of Lords for a private bill to disinherit John, who had become insane in 1711 while abroad and was considered incurable.
- Hon. Robert Digby (c. 1692 – 19 August 1726)
- Hon. Edward Digby (c. 1693 – 1746), married and had issue
- Hon. Wriothesley Digby (d. 12 May 1767) He matriculated at Magdalen College on 9 March 1713/4 and received a BA in 1716. He obtained a BCL from All Souls College, Oxford in 1721, was admitted a barrister of the Middle Temple in 1725, and awarded a DCL in 1726. He married Mary Cotes of Woodcote and had issue.
- Hon. Mary Digby (c. 1689 – 31 March 1729)
- Hon. Elizabeth Digby (d. 1730), married Sir John Dolben, 2nd Baronet and was the mother of Sir William Dolben, 3rd Baronet, the noted campaigner against the slave trade
- Hon. Rachel Digby, died young
- Hon. Jane Digby, died young
- Hon. Juliana Digby, married Herbert Mackworth
- Hon. Catharine Digby (c. 1702 – 13 April 1745)
- Hon. Frances Digby (died 19 September 1788), married James Cotes of Woodcote
- Hon. Jane Digby (c. 1706 – 1 October 1738)
In 1708, he 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.
- Erskine-Hill, Howard (1975) 'Christian Nobleman': William, fifth Baron Digby of Geashill (1662–1752) in: The Social Milieu of Alexander Pope
- Foster, Joseph, ed. (1891). Alumni Oxonienses 1500-1714. Oxford. Retrieved 16 June 2015.
- Debrett, John (1820). Debrett's Peerage of England, Scotland and Ireland. London: G. Woodfall. p. 306.
- Debrett's Peerage. 1973.
|Parliament of England|
| Member of Parliament for Warwick
With: William Colemore 1689–95
Francis Greville 1695–98
Sir Thomas Wagstaffe
|Peerage of Ireland|
| Baron Digby
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