The Lieutenant Governor of New Brunswick (/lɛfˈtɛnənt/, in French: Lieutenant-gouverneur (if male) or Lieutenante-gouverneure (if female) du Nouveau-Brunswick) is the viceregal representative in New Brunswick of the Canadian monarch, King Charles III, who operates distinctly within the province but is also shared equally with the ten other jurisdictions of Canada, as well as the other Commonwealth realms and any subdivisions thereof, and resides predominantly in his oldest realm, the United Kingdom. The Lieutenant Governor of New Brunswick is appointed in the same manner as the other provincial viceroys in Canada and is similarly tasked with carrying out most of the monarch's constitutional and ceremonial duties.

Lieutenant Governors of New Brunswick, (1786 to 1867)

Lieutenant Governors under King George III (1786 to 1820)

• Thomas Carleton (20 May 1786 to 2 February 1817)
  • Gabriel George Ludlow (Acting) (5 October 1805 to 12 February 1808)
  • Edward Winslow (Acting) 20 February 1808 to 24 May 1808)
  • Martin Hunter (Acting) (24 May 1808 to 17 December 1808)
  • George Johnstone (Acting) (17 December 1808 to 28 April 1809)
  • Martin Hunter (Acting for 2nd time) (28 April 1809 to 10 September 1811)
  • William Balfour (Acting) (10 September 1811 to 14 November 1811)
  • Martin Hunter (Acting for 3rd time) (14 November 1811 to 15 June 1812)
  • George Stracey Smyth (Acting) (15 June 1812 to 17 August 1813)
  • Sir Thomas Saumarez (Acting) (17 August 1813 to 14 August 1814)
  • George Stracey Smyth (Acting) (14 August 1814 to 25 June 1816)
  • Harris W. Hailes (Acting) (25 June 1816 to 30 June 1817)
• George Stracey Smyth (1 July 1817 to →)

Lieutenant Governors under King George IV (1820 to 1830)

• cont... (← to 27 March 1823)
• Howard Douglas (28 August 1824 to →)

Lieutenant Governors under King William IV (1830 to 1837)

• cont... (← to 8 September 1831)
• Sir Archibald Campbell (9 September 1831 to 1 May 1837)
• Sir John Harvey (1 May 1837 to →)

Lieutenant Governors under Queen Victoria (1837 to 1867)

• cont... (← to 26 April 1841)
• Sir William MacBean George Colebrooke (27 April 1841 to 11 April 1848)
• Sir Edmund Walker Head (11 April 1848 to 28 September 1854)
• John Manners-Sutton (7 October 1854 to 26 October 1861)
• Arthur Charles Hamilton-Gordon (26 October 1861 to 30 September 1866)

Lieutenant Governors of New Brunswick Since 1867

Lieutenant Governors under Queen Victoria (1867 to 1901)

• Charles Hastings Doyle (1 July 1867 to 18 October 1867)
• Francis Pym Harding (18 October 1867 to 22 July 1868)
• Lemuel Allan Wilmot (23 July 1868 to 15 November 1873)
• Sir Samuel Leonard Tilley (15 November 1873 to 11 July 1878)
• Edward Barron Chandler (16 July 1878 to 6 February 1880)
• Robert Duncan Wilmot (11 February 1880 to 11 November 1885)
• Sir Samuel Leonard Tilley (2nd time) (11 November 1885 to 21 September 1893)
• John Boyd (21 September 1893 to 4 December 1893)
• John James Fraser (20 December 1893 to 24 November 1896)
• Abner Reid McClelan (9 December 1896 to →)

Lieutenant Governors under King Edward VII (1901 to 1910)

• cont... (← to 21 January 1902)
• Jabez Bunting Snowball (28 January 1902 to 24 February 1907)
• Lemuel John Tweedie (5 March 1907 to →)

Lieutenant Governors under King George V (1910 to 1936)

• cont... (← to 6 March 1912)
• Josiah Wood (6 March 1912 to 29 June 1917)
• Gilbert Ganong (29 June 1917 to 31 October 1917)
• William Pugsley (6 November 1917 to 28 February 1923)
• William Frederick Todd (28 February 1923 to 28 December 1928)
• Hugh Havelock McLean (28 December 1928 to 31 January 1935)
• Murray MacLean (8 February 1935 to →)

Lieutenant Governor under King Edward VIII (1936)

• cont... (← to →)

Lieutenant Governors under King George VI (1936 to 1952)

• cont... (← to 5 March 1940)
• William George Clark (5 March 1940 to 1 November 1945)
• David Laurence MacLean (1 November 1945 to →)

Lieutenant Governors under Queen Elizabeth II (1952 to 2022)

• cont... (← to 5 June 1958)
• Joseph Leonard O'Brien (6 June 1958 to 9 June 1965)
• John B. McNair (9 June 1965 to 31 January 1968)
• Wallace Samuel Bird (1 February 1968 to 2 October 1971)
• Hédard Robichaud (8 October 1971 to 23 December 1981)
• George F. G. Stanley (23 December 1981 to 20 August 1987)
• Gilbert Finn (20 August 1987 to 21 June 1994)
• Margaret McCain (21 June 1994 to 18 April 1997)
• Marilyn Trenholme Counsell (18 April 1997 to 26 August 2003)
• Herménégilde Chiasson (26 August 2003 to 30 September 2009)
• Graydon Nicholas (30 September 2009 to 23 October 2014)
• Jocelyne Roy-Vienneau (23 October 2014 to 2 August 2019)
• Brenda Murphy (8 September 2019 to →)

Lieutenant Governors under King Charles III (2022 to present)

• cont... (← to present)