This is a list of people who have served as Lord-Lieutenant of Northumberland. Since 1802, all Lords Lieutenant have also been Custos Rotulorum of Northumberland.

• Henry Percy, 3rd Earl of Northumberland
• Henry Percy, 4th Earl of Northumberland ?–1489
• Henry Algernon Percy, 5th Earl of Northumberland 28 April 1489 – 19 May 1527
• Henry Hastings, 3rd Earl of Huntingdon 20 August 1586 – 14 December 1595
• vacant
• George Clifford, 3rd Earl of Cumberland 1603–1605
• vacant
• Francis Clifford, 4th Earl of Cumberland 27 October 1607 – 31 August 1639 jointly with
• George Home, 1st Earl of Dunbar 27 October 1607 – 20 January 1611 and
• Theophilus Howard, 2nd Earl of Suffolk 27 October 1607 – 31 August 1639 and
• Henry Clifford, 1st Baron Clifford 27 October 1607 – 31 August 1639 and
• Thomas Howard, 21st Earl of Arundel 23 July 1632 – 31 August 1639 and
• Henry Howard, Lord Maltravers 23 July 1632 – 31 August 1639
• Algernon Percy, 10th Earl of Northumberland 13 November 1626 – 1642
• Interregnum
• Algernon Percy, 10th Earl of Northumberland 12 September 1660 – 13 October 1668 jointly with
• Joceline Percy, 11th Earl of Northumberland 12 September 1660 – 31 May 1670
• William Cavendish, 1st Duke of Newcastle-upon-Tyne 13 July 1670 – 25 December 1676 jointly with
• Henry Cavendish, 2nd Duke of Newcastle-upon-Tyne 13 July 1670 – 20 April 1689
• Richard Lumley, 1st Earl of Scarbrough 20 April 1689 – 17 December 1721
• Richard Lumley, 2nd Earl of Scarbrough 24 January 1722 – 29 January 1740
• Charles Bennet, 2nd Earl of Tankerville 6 March 1740 – 14 March 1753
• Hugh Percy, 1st Duke of Northumberland 23 March 1753 – 6 June 1786
• Hugh Percy, 2nd Duke of Northumberland 16 September 1786 – 1798
• In commission
• Hugh Percy, 2nd Duke of Northumberland 4 June 1802 – 10 July 1817
• Hugh Percy, 3rd Duke of Northumberland 18 August 1817 – 11 February 1847
• Henry Grey, 3rd Earl Grey 13 March 1847 – 1 January 1877
• Algernon Percy, 6th Duke of Northumberland 1 January 1877 – 2 January 1899
• Albert Grey, 4th Earl Grey 1 March 1899 – 13 December 1904
• Henry Percy, 7th Duke of Northumberland 13 December 1904 – 14 May 1918
• Alan Percy, 8th Duke of Northumberland 19 July 1918 – 23 August 1930
• Sir Charles Trevelyan, 3rd Baronet 7 November 1930 – 28 April 1949
• Wentworth Beaumont, 2nd Viscount Allendale 28 April 1949 – 16 December 1956
• Hugh Percy, 10th Duke of Northumberland 16 May 1956 – 3 January 1984
• Matthew White Ridley, 4th Viscount Ridley 3 January 1984 – 25 August 2000^[1]
• Sir John Buchanan-Riddell, 13th Baronet 25 August 2000 – 11 May 2009^[2]
• Jane Percy, Duchess of Northumberland 12 May 2009 – present^[3]

Deputy Lieutenants

Deputy Lieutenants traditionally supported the Lord-Lieutenant. There could be many deputy lieutenants at any time, depending on the population of the county. Their appointment did not terminate with the changing of the Lord-Lieutenant, but they often retired at age 75.

• Edward Grey, 1st Viscount Grey of Fallodon 11 April 1901 ^[4]
• Sir Benjamin Chapman Browne 11 April 1901 ^[4]
• Sir William Haswell Stephenson 11 April 1901 ^[4]
• William Watson-Armstrong, 1st Baron Armstrong 11 April 1901 ^[4]
• Shallross Fitzherbert Widdrington 11 April 1901 ^[4]
• Henry de La Poer Beresford, 6th Marquess of Waterford 21 May 1901^[5]
• George Montagu Bennet, 7th Earl of Tankerville 21 May 1901 ^[5]
• Sir Hubert Edward Henry Jerningham 21 May 1901 ^[5]
• Matthew White Ridley, 2nd Viscount Ridley 21 May 1901 ^[5]
• Lawrence William Adamson, 21 May 1901 ^[5]
• Stephen Sanderson, 21 May 1901 ^[5]
• John Coppin Straker, 21 May 1901 ^[5][6]
• Hugh Andrews,21 May 1901 ^[5]
• Addington Francis Baker Cresswell, 21 May 1901 ^[5]
• Pierre Gabriel Theodore, 1st Count de Loriol Chandieu^[7]