This is an incomplete list of people who have served as Lord Lieutenant of Hertfordshire.

• Sir Ralph Sadleir
• Robert Dudley, 1st Earl of Leicester 3 July 1585 – 4 September 1588
• William Cecil, 1st Baron Burghley 31 December 1588 – 4 August 1598
• vacant
• Robert Cecil, 1st Earl of Salisbury 5 August 1605 – 24 May 1612
• William Cecil, 2nd Earl of Salisbury 10 July 1612 – 1642 jointly with
• Charles Cecil, Viscount Cranborne 31 March 1640 – 1642
• Interregnum
• Arthur Capell, 1st Earl of Essex 26 July 1660 – 1681
• John Egerton, 2nd Earl of Bridgewater 10 February 1681 – 26 October 1686
• Laurence Hyde, 1st Earl of Rochester 18 November 1686 – 1688
• Charles Talbot, 1st Duke of Shrewsbury 4 April 1689 – 1691
• Algernon Capell, 2nd Earl of Essex 3 February 1692 – 10 January 1710
• William Cowper, 1st Earl Cowper 26 August 1710 – 1712
• James Cecil, 5th Earl of Salisbury 26 June 1712 – 1714
• William Cowper, 1st Earl Cowper 5 March 1715 – 1722
• William Capell, 3rd Earl of Essex 11 October 1722 – 8 January 1743
• vacant
• William Clavering-Cowper, 2nd Earl Cowper 8 March 1744 – 18 September 1764
• William Capell, 4th Earl of Essex 12 November 1764 – 1771
• James Cecil, 1st Marquess of Salisbury 13 March 1771 – 13 June 1823
• James Grimston, 1st Earl of Verulam 5 July 1823 – 17 November 1845
• James Grimston, 2nd Earl of Verulam 17 January 1846 – 1892
• Edward Villiers, 5th Earl of Clarendon 23 August 1892 – 2 October 1914
• Thomas Brand, 3rd Viscount Hampden 9 February 1915 – 1952
• Sir David Bowes-Lyon 1 July 1952 – 13 September 1961
• Sir George Burns 8 December 1961 – 12 February 1986
• Sir Simon Bowes-Lyon 12 February 1986 – 27 July 2007^[1]
• Dione Grimston, Countess of Verulam 27 July 2007 – present^[2]

References

• J.C. Sainty (1970). "Lieutenancies of Counties, 1585–1642". Bulletin of the Institute of Historical Research (Special Supplement No. 8). 
• J.C. Sainty (1979). List of Lieutenants of Counties of England and Wales 1660-1974. London: Swift Printers (Sales) Ltd. 

1. ^ London Gazette, issue no.50432, February 17, 1986
2. ^ London Gazette, issue no. 58411, 3 August 2007