This is a list of people to have been Lord Lieutenant of County Londonderry.

There were lieutenants of counties in Ireland until the reign of James II, when they were renamed governors.^[1] The office of Lord Lieutenant was recreated on 23 August 1831.

Governors

• John Skeffington, Viscount Massareene: 1678- ^[2]
• Henry Conyngham, 1st Earl Conyngham: –1781
• Thomas Conolly: 1761–1795^[3]
• Edward Cary: 1789–1794^[4]
• Robert Stewart, Viscount Castlereagh: 1805–1822
• Charles Vane, 3rd Marquess of Londonderry:1822–1831^[5]

Lord Lieutenants

• George Canning, 1st Baron Garvagh: 7 October 1831 – 20 August 1840
• Sir Robert Ferguson, 2nd Baronet: 1840 – 13 March 1860
• Acheson Lyle: 10 April 1860 – 22 April 1870
• Robert Peel Dawson: 25 June 1870 – 2 September 1877
• Sir Henry Bruce, 3rd Baronet: 1877 – 8 December 1907
• John Cooke: 24 January 1908 – December 1910
• David Cleghorn Hogg: 7 January 1911 – 22 August 1914
• James Jackson Clark: 31 March 1915 – 1926
• Maurice Marcus McCausland: 30 October 1926 – 14 January 1938
• Sir Charles Stronge, 7th Baronet: 28 June 1938 – 5 December 1939
• William Lowry Lenox-Conyngham: 2 February 1940 – 5 June 1957
• Sir Dudley McCorkell: 10 October 1957 – 30 May 1960
• Sir Henry Mulholland, 1st Baronet: 17 October 1960 – 1965
• John Cherry Drennan: 1965 - 1974
• Colonel Sir Michael McCorkell: 13 June 1975 – 2000
• Sir Denis Desmond: 14 June 2000 – 11 May 2018^[6]
• Helen Rosemary Alison Millar: 12 June 2018 – present^[7]

Deputy lieutenants

A deputy lieutenant of County Londonderry is commissioned by the Lord Lieutenant of County Londonderry. Deputy lieutenants support the work of the lord-lieutenant. There can be several deputy lieutenants at any time, depending on the population of the county. Their appointment does not terminate with the changing of the lord-lieutenant, but they usually retire at age 75.

21st Century

• 29 October 2015: Helen Mark^[8]