This noble title was created in 1780 for Sir William de Grey on his retirement as Lord Chief Justice, who had previously served as Solicitor-General and as Attorney-General. His son, the second Baron, represented Wareham, Tamworth and Lostwithiel in the House of Commons and served as Joint Postmaster-General from 1787 to 1794; Lord Walsingham was also Chairman of Committees in the House of Lords for many years. His eldest son, the third Baron, was a Lieutenant-General in the Army, who was succeeded by his younger brother, the Archdeacon of Surrey, as fourth Baron. His grandson, the sixth Baron, was a Conservative Member of Parliament for Norfolk West and served as a Government Whip from 1874 to 1875 in Benjamin Disraeli's second administration. On his death the title passed to his half-brother, the seventh Baron, a barrister.
In 1929, his son Lieutenant-Colonel George de Grey succeeded as eighth Baron; he was appointed DSO, OBE and OStJ. His only son, Captain John de Grey MC, succeeded as the ninth and present Baron in 1965.
- William de Grey (d. 1687), Member of Parliament for Thetford 1685
- Thomas de Grey (1680-1765), Member of Parliament for Norfolk 1715–1727
- Thomas de Grey (1717-1781), Member of Parliament for Norfolk 1764-1774;
Barons Walsingham (1780)
- William de Grey, 1st Baron Walsingham (1719–1781)
- Thomas de Grey, 2nd Baron Walsingham (1748–1818)
- George de Grey, 3rd Baron Walsingham (1776–1831)
- Thomas de Grey, 4th Baron Walsingham (1788–1839)
- Thomas de Grey, 5th Baron Walsingham (1804–1870)
- Thomas de Grey, 6th Baron Walsingham (1843–1919)
- John Augustus de Grey, 7th Baron Walsingham (1849–1929)
- George de Grey, 8th Baron Walsingham (1884–1965)
- John de Grey, 9th Baron Walsingham (b. 1925)
The heir apparent's heir is his son Thomas de Grey (b. 1997)
- Cokayne, George E.; Gibbs, Vicary; Doubleday, Harry A. (1949). The Complete Peerage of Great Britain of Ireland. XIV vols. London: St Catherine's Press.
- Kidd, Charles; Williamson, David (1990). Debrett's Peerage and Baronetage. London and New York: St Martin's Press.
- Mosley, Charles (1999). Burke's Peerage and Baronetage of Great Britain and Ireland. London: Genealogical Publishing Ltd.