The title was created in 1620 for Robert Digby, Governor of King's County. He was the nephew of John Digby, 1st Earl of Bristol. Lord Digby's grandson, the third Baron, and the latter's younger brothers the fourth and fifth Barons, all represented Warwick in Parliament.
The 5th Baron's grandson, the 6th Baron, sat as a Member of Parliament for Malmesbury and for Wells. His younger brother, the 7th Baron, represented Ludgershall and Wells in the House of Commons. In 1765 he was created Baron Digby, of Sherborne in the County of Dorset, in the Peerage of Great Britain, with remainder to the male issue of his father. In 1790 Lord Digby was further honoured when he was made Viscount Coleshill and Earl Digby in the Peerage of Great Britain, with remainder to the issue male of his body.
However, he was succeeded in the two baronies by his first cousin twice removed, the 9th Baron. He was the son of Admiral Sir Henry Digby, son of the Very Reverend the Honourable William Digby, younger brother of the 6th Baron and the first Earl Digby. His son, the 10th Baron, sat as a Conservative Member of Parliament for Dorset. He was succeeded by his son, the 11th Baron. He was Chairman of the Dorset County Council from 1955 to 1964 and Lord Lieutenant of Dorset from 1952 to 1964. As of 2010 the titles are held by his son, the 12th Baron, who succeeded in 1964. He notably served as Lord Lieutenant of Dorset from 1984 to 1999.
Two female members of the family have also gained fame. Jane Digby was the sister of the 9th Baron Digby while Hon. Pamela Harriman (née Digby), American Ambassador to France, was the eldest daughter of the 11th Baron and the sister of the 12th Baron.
Barons Digby (1620)
- Robert Digby, 1st Baron Digby (c. 1599–1642)
- Kildare Digby, 2nd Baron Digby (c. 1627–1661)
- Robert Digby, 3rd Baron Digby (1654–1677)
- Simon Digby, 4th Baron Digby (1657–1685)
- William Digby, 5th Baron Digby (1661–1752)
- Edward Digby, 6th Baron Digby (1730–1757)
- Henry Digby, 7th Baron Digby (died 1793) (created Earl Digby in 1790)
Earl Digby (1790)
- Henry Digby, 1st Earl Digby, 7th Baron Digby (d. 1793)
- Edward Digby, 2nd Earl Digby, 8th Baron Digby (1773–1856)
Barons Digby (1620; Reverted)
- Edward St Vincent Digby, 9th Baron Digby (1809–1889)
- Edward Henry Trafalgar Digby, 10th Baron Digby (1846–1920)
- Edward Kenelm Digby, 11th Baron Digby (1894–1964)
- Edward Henry Kenelm Digby, 12th Baron Digby (b. 1924)
The heir apparent is the present holder's son the Hon. Henry Noel Kenelm Digby (b. 1954)
The heir apparent's heir apparent is his son Edward St Vincent Kenelm Digby (b. 1985)
- Kidd, Charles, Williamson, David (editors). Debrett's Peerage and Baronetage (1990 edition). New York: St Martin's Press, 1990.
- Leigh Rayment's Peerage Pages