# List of New Brunswick by-elections

The list of New Brunswick by-elections includes every by-election held in the Canadian province of New Brunswick. By-elections occur whenever there is a vacancy in the Legislative Assembly, although an imminent general election may allow the vacancy to remain until the dissolution of parliament. Between 1842 and 1927 incumbent members were required to recontest their seats upon being appointed to Cabinet. These Ministerial by-elections were almost always uncontested.

## 60th New Brunswick Legislature 2020–2024

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Bathurst East-Nepisiguit-Saint-Isidore | April 24, 2023 | Denis Landry | Liberal | Susan Holt | Liberal | Resigned to run for Mayor of Hautes-Terre, elected. | Yes |
| Restigouche-Chaleur | April 24, 2023 | Daniel Guitard | Liberal | Marco LeBlanc | Liberal | Resigned to run for Mayor of Belle-Baie, elected. | Yes |
| Dieppe | April 24, 2023 | Roger Melanson | Liberal | Richard Losier | Liberal | Resigned. | Yes |
| Southwest Miramichi-Bay du Vin | June 20, 2022 | Jake Stewart | Progressive Conservative | Michael Dawson | Progressive Conservative | Resigned to run federally in Miramichi—Grand Lake; elected. | Yes |
| Miramichi Bay-Neguac | June 20, 2022 | Lisa Harris | Liberal | Réjean Savoie | Progressive Conservative | Resigned to run federally in Miramichi—Grand Lake; defeated. | No |

## 59th New Brunswick Legislature 2018–2020

No by-elections were held during the 59th New Brunswick Legislature's term.

## 58th New Brunswick Legislature 2014–2018

| By-election | Date | Incumbent | Party | Party | Winner | Party | Party | Cause | Retained |
| Carleton | October 5, 2015 | David Alward | | Progressive Conservative | Stewart Fairgrieve | | Progressive Conservative | Resignation to become Consul to Boston | Yes |
| Saint John East | November 17, 2014 | Gary Keating | | Liberal | Glen Savoie | | Progressive Conservative | Resignation | No |

## 57th New Brunswick Legislature 2010–2014

| By-election | Date | Incumbent | Party | Party | Winner | Party | Party | Cause | Retained |
| Kent | April 15, 2013 | Shawn Graham | | Liberal | Brian Gallant | | Liberal | Resignation | Yes |
| Rothesay | June 25, 2012 | Margaret-Ann Blaney | | Progressive Conservative | Ted Flemming | | Progressive Conservative | Resignation to become CEO of Efficiency New Brunswick | Yes |

## 56th New Brunswick Legislature 2006–2010

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Restigouche-La-Vallée | March 9, 2009 | Percy Mockler | Progressive Conservative | Burt Paulin | Liberal | Appointed to Senate | No |
| New Maryland-Sunbury West | November 3, 2008 | Keith Ashfield | Progressive Conservative | Jack Carr | Progressive Conservative | Resignation to contest the 2008 Federal Election | Yes |
| Moncton East | March 5, 2007 | Bernard Lord | Progressive Conservative | Chris Collins | Liberal | Resignation | No |

## 55th New Brunswick Legislature 2003–2006

| By-election | Date | Incumbent | Party | Party | Winner | Party | Party | Cause | Retained |
| Saint John Harbour | November 14, 2005 | Elizabeth Weir | | New Democratic | Ed Doherty | | Liberal | Resignation | No |
| Shediac-Cap-Pelé | October 4, 2004 | Bernard Richard | | Liberal | Victor Boudreau | | Liberal | Resignation to become Provincial Ombudsman | Yes |

## 54th New Brunswick Legislature 1999–2003

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Kent South | April 23, 2001 | Camille Thériault | Liberal | Claude Williams | Progressive Conservative | Resignation | No |
| Caraquet | February 5, 2001 | Bernard Thériault | Liberal | Gaston Moore | Progressive Conservative | Resignation to contest the 2000 Federal Election | No |
| Campbellton | February 5, 2001 | Edmond Blanchard | Liberal | Jean F. Dubé | Progressive Conservative | Appointed to the Federal Court of Canada | No |

## 53rd New Brunswick Legislature 1995–1999

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Moncton East | October 19, 1998 | Ray Frenette | Liberal | Bernard Lord | Progressive Conservative | Resignation | No |
| Kent | October 19, 1998 | Alan R. Graham | Liberal | Shawn Graham | Liberal | Resignation | Yes |
| Fredericton South | October 19, 1998 | Russell King | Liberal | Brad Green | Progressive Conservative | Resignation | No |
| Tantramar | November 17, 1997 | Marilyn Trenholme Counsell | Liberal | Peter Mesheau | Progressive Conservative | Appointed Lieutenant Governor | No |
| Miramichi-Bay du Vin | November 17, 1997 | Frank McKenna | Liberal | James Doyle | Liberal | Resignation | Yes |
| Victoria-Tobique | June 23, 1997 | Larry Kennedy | Liberal | Larry Kennedy | Liberal | Void Election | Yes |

## 52nd New Brunswick Legislature 1991–1995

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Tracadie | September 26, 1994 | Denis Losier | Liberal | Elvy Robichaud | Progressive Conservative | Resignation | No |
| Madawaska South | November 29, 1993 | Pierrette Ringuette | Liberal | Percy Mockler | Progressive Conservative | Resignation to contest the 1993 Federal Election | No |
| Carleton North | June 28, 1993 | Fred Harvey | Liberal | Dale Graham | Progressive Conservative | Resignation following conviction for election fraud | No |
| Moncton North | February 15, 1993 | Michael McKee | Liberal | John Lebans | Liberal | Appointed a judge | Yes |

## 51st New Brunswick Legislature 1987–1991

| By-election | Date | Incumbent | Party | Party | Winner | Party | Party | Cause | Retained |
| Tracadie | November 14, 1988 | Doug Young | | Liberal | Denis Losier | | Liberal | Resignation to contest the 1988 Federal Election | Yes |

## 50th New Brunswick Legislature 1982–1987

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Edmundston | February 10, 1986 | Jean-Maurice Simard | Progressive Conservative | Robert Beaulieu | Liberal | Appointed to the Senate | No |
| Riverview | April 29, 1985 | Brenda Robertson | Progressive Conservative | Hubert Seamans | Liberal | Appointed to the Senate | No |
| Madawaska-Centre | November 26, 1984 | Gérald Clavette | Liberal | Donald Marmen | Progressive Conservative | Resignation to contest the 1984 Federal Election | No |
| East Saint John | November 26, 1984 | Gerald Merrithew | Progressive Conservative | Peter Trites | New Democratic | Resignation to contest the 1984 Federal Election | No |

## 49th New Brunswick Legislature 1978–1982

| By-election | Date | Incumbent | Party | Party | Winner | Party | Party | Cause | Retained |
| Bay du Vin | November 5, 1979 | Norbert Thériault | | Liberal | Reginald MacDonald | | Liberal | Appointed to the Senate | Yes |

## 48th New Brunswick Legislature 1974–1978

| By-election | Date | Incumbent | Party | Party | Winner | Party | Party | Cause | Retained |
| Victoria-Tobique | November 29, 1976 | J. Stewart Brooks | | Progressive Conservative | J. Douglas Moore | | Progressive Conservative | Resignation | Yes |

## 47th New Brunswick Legislature 1970–1974

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| York | September 30, 1974 | Harry Ames | Progressive Conservative | David Bishop | Progressive Conservative | Death | Yes |
| Campbellton | September 30, 1974 | Charles Van Horne | Progressive Conservative | Fernand Dubé | Progressive Conservative | Resignation | Yes |
| Saint John Centre | June 25, 1973 | George E. McInerney | Progressive Conservative | John W. Fernhill | Liberal | Death | No |
| Saint John East | December 11, 1972 | Charles A. McIlveen | Progressive Conservative | Gerald Merrithew | Progressive Conservative | Death | Yes |
| Charlotte | December 11, 1972 | John E. Rigby | Progressive Conservative | James N. Tucker, Jr. | Progressive Conservative | Death | Yes |
| Bathurst | December 11, 1972 | H. H. Williamson | Liberal | Eugene McGinley | Liberal | Death | Yes |
| Gloucester | September 18, 1972 | Bernard Jean | Liberal | Lorenzo Morais | Progressive Conservative | Resignation | No |
| Kent | October 1, 1971 | Louis Robichaud | Liberal | Omer Léger | Progressive Conservative | Resignation | No |

## 46th New Brunswick Legislature 1967–1970

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Northumberland | June 16, 1969 | J. L. A. Savoie | Liberal | Frank E. Kane | Liberal | Death | Yes |
| Restigouche | November 4, 1968 | J.M. Joffre Daigle | Liberal | Charles Van Horne | Progressive Conservative | Death | No |
| Fredericton City | June 10, 1968 | John F. McInerney | Progressive Conservative | Lawrence Garvie | Progressive Conservative | Death | Yes |

## 45th New Brunswick Legislature 1963–1967

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Restigouche | February 6, 1967 | Georges Dumont | Liberal | Charles Van Horne | Progressive Conservative | Death | No |
| Saint John City | September 12, 1966 | Daniel Aloysius Riley | Liberal | Stephen Weyman | Liberal | Resignation | Yes |
| Westmorland | September 27, 1965 | Donald C. Harper | Liberal | W. Wynn Meldrum | Liberal | Death | Yes |
| Kent | March 16, 1964 | Hugh A. Dysart | Liberal | Camille Bordage | Liberal | Death | Yes |

## 44th New Brunswick Legislature 1960–1963

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Kings | December 3, 1962 | Gordon Fairweather | Progressive Conservative | John B. M. Baxter, Jr. | Progressive Conservative | Resignation to contest the 1962 Federal Election | Yes |
| Kings | December 3, 1962 | Harry N. Jonah | Progressive Conservative | George E. Horton | Progressive Conservative | Appointed a judge | Yes |
| Northumberland | June 19, 1961 | Paul B. Lordon | Liberal | J. Fraser Kerr | Liberal | Resignation | Yes |
| Carleton | June 19, 1961 | Hugh John Flemming | Progressive Conservative | Richard Hatfield | Progressive Conservative | Resignation to contest a federal by-election | Yes |

## 43rd New Brunswick Legislature 1956–1960

no by-elections

## 42nd New Brunswick Legislature 1952–1956

no by-elections

## 41st New Brunswick Legislature 1948–1952

| By-election | Date | Incumbent | Party | Party | Winner | Party | Party | Cause | Retained |
| Charlotte | January 9, 1950 | James Joseph Hayes Doone | | Liberal | William N. Campbell | | Liberal | Appointed to the Senate | Yes |

## 40th New Brunswick Legislature 1944–1948

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Saint John County | July 30, 1945 | Alphonso Colby Smith | Progressive Conservative | Edward Claude Seeley | Independent | Death | No |
| Restigouche | July 30, 1945† | Benoît Michaud | Liberal | Jean-Baptiste D'Astous | Liberal | Resignation to contest the 1945 Federal Election | Yes |
| Gloucester | July 30, 1945† | Clovis-Thomas Richard | Liberal | J. Michel Fournier | Liberal | Resignation to contest the 1945 Federal Election | Yes |
| Victoria | May 21, 1945† | Frederick William Pirie | Liberal | Michael F. McCloskey | Liberal | Appointed to the Senate | Yes |
† Won by acclamation

## 39th New Brunswick Legislature 1939–1944

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Gloucester | August 19, 1940† | Frederick T. B. Young | Liberal | Joseph E. Connolly | Liberal | Death | Yes |
| Kent | March 27, 1940† | Allison Dysart | Liberal | J. Killeen McKee | Liberal | Appointed a judge | Yes |
| Victoria | January 24, 1940 | John W. Niles | Liberal | John B. McNair | Liberal | Resignation to provide a seat for McNair | Yes |
† Won by acclamation

## 38th New Brunswick Legislature 1935–1939

no by-elections

## 37th New Brunswick Legislature 1930–1935

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Gloucester | October 26, 1931 | John P. Lordon | Liberal | Wesley H. Coffyn | Conservative | Death | No |
| Saint John County | June 29, 1931 | John Babington Macaulay Baxter | Conservative | Robert McAllister | Conservative | Appointed Chief Justice of New Brunswick | Yes |
| Westmorland | October 7, 1930† | Melville A. Oulton | Conservative | Lewis Smith | Conservative | Appointed Medical Officer of the New Brunswick Worker's Compensation Board | Yes |
† Won by acclamation

## 36th New Brunswick Legislature 1925–1930

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Albert | February 22, 1927† | John L. Peck | Conservative | Conrad J. Osman | Conservative | Death | Yes |
| Gloucester | December 17, 1926† | Peter Veniot | Liberal | Clovis-Thomas Richard | Liberal | Resignation to contest the 1926 Federal Election | Yes |
| Saint John County | December 10, 1926† | Frank L. Potts | Conservative | H. Colby Smith | Conservative | Death | Yes |
| St. Stephen-Milltown | December 13, 1925† | John M. Flewelling | Conservative | Arthur R. MacKenzie | Conservative | Death | Yes |
| Westmorland | September 26, 1925† | Antoine Joseph Léger | Conservative | Antoine Joseph Léger | Conservative | Sought re-election upon appointment as Provincial Secretary-Treasurer | Yes |
| Saint John County | September 26, 1925† | John Babington Macaulay Baxter | Conservative | John Babington Macaulay Baxter | Conservative | Sought re-election upon appointment as Premier and Attorney General | Yes |
| Restigouche | September 26, 1925† | David A. Stewart | Conservative | David A. Stewart | Conservative | Sought re-election upon appointment as Minister of Public Works | Yes |
| Fredericton City | September 26, 1925† | Charles Dow Richards | Conservative | Charles Dow Richards | Conservative | Sought re-election upon appointment as Minister of Lands and Mines | Yes |
| Charlotte | September 26, 1925† | Henry I. Taylor | Conservative | Henry I. Taylor | Conservative | Sought re-election upon appointment as Minister of Public Health | Yes |
| Albert | September 26, 1925† | Lewis Smith | Conservative | Lewis Smith | Conservative | Sought re-election upon appointment as Minister of Agriculture | Yes |
† Won by acclamation

## 35th New Brunswick Legislature 1920–1925

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Gloucester | February 5, 1925 | James P. Byrne | Liberal | Ivan Rand | Liberal | Appointed a judge | Yes |
| Moncton City | December 1, 1924 | Clifford William Robinson | Liberal | E. Albert Reilly | Conservative | Appointed to the Senate | No |
| Gloucester | February 8, 1923† | Jean George Robichaud | Liberal | J. André Doucet | Liberal | Resignation to contest a federal by-election | Yes |
| Kings | June 17, 1922 | George Burpee Jones | Conservative | James D. McKenna | Liberal | Resignation to contest the 1921 Federal Election | No |
| Saint John County | June 10, 1922 | John Babington Macaulay Baxter | Conservative | Allister Bentley | Liberal | Resignation to contest the 1921 Federal Election | No |
| Madawaska | June 3, 1922† | Donat L. Daigle | Liberal | Lorne J. Violette | Liberal | Appointed Sheriff of Madawaska | Yes |
| Northumberland | October 3, 1921 | John Vanderbeck | Liberal | Abram V. Vanderbeck | Liberal | Death | Yes |
| Sunbury | December 27, 1920† | David W. Mersereau | Liberal | David W. Mersereau | Liberal | Sought re-election upon appointment as Minister of Agriculture | Yes |
| Queens | December 27, 1920† | Judson Hetherington | Liberal | Judson Hetherington | Liberal | Sought re-election upon appointment as Provincial Secretary-Treaurer | Yes |
† Won by acclamation

## 34th New Brunswick Legislature 1917–1920

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Saint John City | June 14, 1920† | William F. Roberts | Liberal | William F. Roberts | Liberal | Sought re-election upon the Minister of Public Health becoming a salaried office | Yes |
| Westmorland | April 23, 1917† | Ernest A. Smith | Liberal | Ernest A. Smith | Liberal | Sought re-election upon appointment as Minister of Lands and Mines | Yes |
| Victoria | April 23, 1917† | John F. Tweeddale | Liberal | John F. Tweeddale | Liberal | Sought re-election upon appointment as Minister of Agriculture | Yes |
| Victoria | April 23, 1917† | James Burgess | Liberal | Walter Edward Foster | Liberal | Resignation to provide a seat for Foster | Yes |
| Northumberland | April 23, 1917† | Robert Murray | Liberal | Robert Murray | Liberal | Sought re-election upon appointment as Provincial Secretary-Treasurer | Yes |
| Gloucester | April 23, 1917† | Peter Veniot | Liberal | Peter Veniot | Liberal | Sought re-election upon appointment as Minister of Public Works | Yes |
| Gloucester | April 23, 1917† | James P. Byrne | Liberal | James P. Byrne | Liberal | Sought re-election upon appointment as Attorney General | Yes |
† Won by acclamation

## 33rd New Brunswick Legislature 1912–1917

| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Carleton | September 21, 1916 | Benjamin Franklin Smith | Conservative | Benjamin Franklin Smith | Conservative | Sought re-election upon appointment as Minister of Public Works | Yes |
| Carleton | September 21, 1916 | Donald Munro | Conservative | William S. Sutton | Conservative | Appointed Registrar of Deeds | Yes |
| Westmorland | May 30, 1916 | Patrick G. Mahoney | Conservative | Ernest A. Smith | Liberal | Sought re-election upon appointment as Minister of Public Works | No |
| Carleton | January 11, 1915 | James Kidd Flemming | Conservative | Benjamin Franklin Smith | Conservative | Resignation | Yes |
| Saint John County | December 31, 1914† | John Babington Macaulay Baxter | Conservative | John Babington Macaulay Baxter | Conservative | Sought re-election upon appointment as Attorney General | Yes |
| York | February 19, 1914 | Harry Fulton McLeod | Conservative | Percy A. Guthrie | Conservative | Resignation to contest a federal by-election | Yes |
| Charlotte | February 19, 1914† | George Johnson Clarke | Conservative | George Johnson Clarke | Conservative | Sought re-election upon appointment as Attorney General | Yes |
| Charlotte | February 19, 1914† | W.C.H. Grimmer | Conservative | Robert Watson Grimmer | Conservative | Appointed to the Supreme Court of New Brunswick | Yes |
| Kings | February 5, 1914† | James Alexander Murray | Conservative | James Alexander Murray | Conservative | Sought re-election upon appointment as Minister of Agriculture | Yes |
† Won by acclamation

## 32nd New Brunswick Legislature 1908–1912

| By-election | Date | Incumbent | Winner | Cause |
| Charlotte | February 10, 1912† | Thomas Aaron Hartt | Scott D. Guptill | Resignation to contest the 1911 Federal Election |
| Sunbury | December 7, 1911† | John Douglas Hazen | George A. Perley | Appointed to the Federal Cabinet |
| Saint John County | December 7, 1911 | James Lowell | John Babington Macaulay Baxter | Resignation to contest the 1911 Federal Election |
| York | March 30, 1911 | Thomas Robison | Oscar E. Morehouse | Death |
| Saint John County | July 20, 1909 | Harrison A. McKeown | Allister F. Bentley | Appointed to the Supreme Court of New Brunswick |
| Northumberland | December 1, 1908 | Donald Morrison | John Percival Burchill | Resignation to contest the 1908 Federal Election |
| Carleton | December 1, 1908 | Benjamin Franklin Smith | George W. Upham | Resignation to contest the 1908 Federal Election |
| York | April 7, 1908† | Harry Fulton McLeod | Harry Fulton McLeod | Sought re-election upon appointment as Solicitor General |
| Sunbury | April 7, 1908† | John Douglas Hazen | John Douglas Hazen | Sought re-election upon appointment as Premier and Attorney General |
| Northumberland | April 7, 1908† | John Morrissy | John Morrissy | Sought re-election upon appointment as Chief Commissioner of Public Works |
| Kent | April 7, 1908† | David-Vital Landry | David-Vital Landry | Sought re-election upon appointment as Commissioner of Agriculture |
| Charlotte | April 7, 1908† | W.C.H. Grimmer | W.C.H. Grimmer | Sought re-election upon appointment as Surveyor General |
| Carleton | April 7, 1908† | James Kidd Flemming | James Kidd Flemming | Sought re-election upon appointment as Provincial Secretary |
† Won by acclamation

## 31st New Brunswick Legislature 1903–1908

| By-election | Date | Incumbent | Winner | Cause |
| Saint John County | November 8, 1907† | Robert C. Ruddick | Harrison A. McKeown | Appointed Inspecting Physician at the Saint John Quarantine Station |
| Westmorland | April 30, 1907† | Clifford William Robinson | Clifford William Robinson | Sought re-election upon appointment as Provincial Secretary |
| Restigouche | January 2, 1907 | Henry F. McLatchy | William Currie | Appointed a County Court Judge |
| Northumberland | March 11, 1905† | W. S. Loggie | Robert Murray | Resignation to contest the 1904 Federal Election |
| Carleton | February 15, 1905† | Wendell P. Jones | Wendell P. Jones | Sought re-election upon appointment as Solicitor General |
| Westmorland | December 30, 1904† | Francis J. Sweeney | Francis J. Sweeney | Sought re-election upon appointment as Solicitor General |
| Saint John County | December 30, 1904 | Albert T. Dunn | James Lowell | Appointed Collector of the Port of Saint John |
| Saint John City | December 30, 1904 | Harrison A. McKeown | Robert Maxwell | Resignation to contest the 1904 Federal Election |
| Madawaska | December 15, 1903† | Narcisse A. Gagnon | Cyprien Martin | Death |
| Saint John City | April 7, 1903† | Harrison A. McKeown | Harrison A. McKeown | Sought re-election upon appointment at Solicitor General |
† Won by acclamation

## 30th New Brunswick Legislature 1899–1903

| By-election | Date | Incumbent | Winner | Cause |
| Kings | March 1, 1902 | Albert Scott White | Ora P. King | Appointed to the Supreme Court of New Brunswick |
| Saint John County | January 18, 1902† | John McLeod | Robert C. Ruddick | Death |
| Westmorland | February 1901† | W. Woodbury Wells | Arthur Bliss Copp | Death |
| Carleton | February 1901† | Frank Broadstreet Carvell | Stephen Burpee Appleby | Resignation to contest the 1900 Federal Election |
| York | February 7, 1901† | Alexander Gibson | George W. Allen | Resignation to contest the 1900 Federal Election |
| Kent | January 1901† | Pierre H. Léger | Richard A. Poirier | Death |
| Queens | October 2, 1900 | Laughlin Farris | Laughlin Farris | Sought re-election upon appointment as Commissioner of Agriculture |
| Albert | September 29, 1900 | Henry Emmerson | Sanford S. Ryan | Resignation to contest the 1900 Federal Election |
| Kings | September 27, 1900 | William Pugsley | William Pugsley | Sought re-election upon appointment as Attorney General |
| Carleton | January 1900 | Charles L. Smith | James Kidd Flemming | Appointed Postmaster of Woodstock |
| Gloucester | December 4, 1899 | Peter Veniot | John Young | Appointed Collector of Customs at Bathurst |
† Won by acclamation

## 29th New Brunswick Legislature 1895–1899

| By-election | Date | Incumbent | Winner | Cause |
| Gloucester | February 28, 1898 | John Sievewright | Joseph Poirier | Death |
| Charlotte | January 15, 1898† | James Mitchell | John Dewolfe Chipman | Death |
| Restigouche | June 23, 1897† | Charles H. LaBillois | Charles H. LaBillois | Sought re-election upon appointment as Commissioner of Agriculture |
| Westmorland | May 29, 1897† | Amasa E. Killam | Clifford William Robinson | Appointed Inspector of Railways for the Inter-Colonial Railway |
| Albert | January 23, 1897 | William James Lewis | Charles J. Osman | Resignation to contest the 1896 Federal Election |
| Queens | September 14, 1896† | Andrew George Blair | Isaac W. Carpenter | Resignation to contest a federal by-election |
| Northumberland | July 30, 1896† | James Robinson | Allan A. Davidson | Resignation to contest a federal by-election |
| Saint John County | July 28, 1896† | Albert T. Dunn | Albert T. Dunn | Sought re-election upon appointment as Surveyor General |
† Won by acclamation

## 28th New Brunswick Legislature 1892–1895

| By-election | Date | Incumbent | Winner | Cause |
| Carleton | January 15, 1895† | Henry A. Connell | Marcus C. Atkinson | Resignation due to election petition |
| Madawaska | January 7, 1895 | Lévite Thériault | Cyprien Martin | Appointed Registrar of Deeds |
| Gloucester | November 5, 1894 | Théotime Blanchard | Peter Veniot | Resignation to contest a federal by-election |
| Kings | February 15, 1893† | Albert Scott White | Albert Scott White | Sought re-election upon appointment as Solicitor General |
| Queens | November 22, 1892 | Thomas Hetherington | Andrew George Blair | Resignation to provide a seat for Blair |
† Won by acclamation

## 27th New Brunswick Legislature 1890–1892

| By-election | Date | Incumbent | Winner | Cause |
| Kent | September 15, 1891 | Olivier J. Leblanc | Auguste Théophile Léger | Resignation to contest the 1891 Federal Election |
| Westmorland | February 14, 1891 | H.T. Stevens | Joseph A. McQueen | Resignation to recontest over election petition |
| Westmorland | February 14, 1891 | Henry Absalom Powell | Henry Absalom Powell | Resignation to recontest over election petition |
| York | October 23, 1890 | Andrew George Blair | Andrew George Blair | Void Election |
| York | October 23, 1890 | William Wilson | William Wilson | Void Election |
| York | October 23, 1890 | John Anderson | John Anderson | Void Election |
| York | October 23, 1890 | Richard Bellamy | Thomas Colter | Void Election |
| Victoria | August 23, 1890 | George Thomas Baird | James Porter | Resignation to recontest over election petition |
| Northumberland | February 20, 1890 | Lemuel John Tweedie | Lemuel John Tweedie | Sought re-election upon appointment as Surveyor General |

## 26th New Brunswick Legislature 1886–1890

| By-election | Date | Incumbent | Winner | Cause |
| King's | May 25, 1889† | William Pugsley | William Pugsley | Sought re-election upon appointment as Solicitor General |
| Albert | February 23, 1889 | Henry Emmerson | Henry Emmerson | By-election results voided |
| Albert | September 28, 1888 | William James Lewis | Henry Emmerson | Resignation to recontest |
| Northumberland | December 13, 1887 | William A. Park | John Morrissy | Appointed Collector of Customs for the Port of Newcastle |
| Kent | August 10, 1887 | William Wheten | James D. Phinney | Appointed High Sheriff of Kent |
| Kent | August 10, 1887 | Olivier J. Leblanc | Olivier J. Leblanc | Resignation to recontest over election petition |
| Madawaska | April 6, 1887 | Lévite Thériault | Lévite Thériault | Resignation to contest the 1887 Federal Election |
| Northumberland | March 16, 1887 | Michael Adams | John Percival Burchill | Resignation to contest the 1887 Federal Election |
| Saint John City | March 8, 1887† | John Valentine Ellis | Silas Alward | Resignation to contest the 1887 Federal Election |
† Won by acclamation

## 25th New Brunswick Legislature 1882–1886

| By-election | Date | Incumbent | Winner | Cause |
| York | July 4, 1885 | Frederick P. Thompson | William Wilson | Appointed to the Legislative Council |
| Kings | July 4, 1885 | Edwin Arnold Vail | William Pugsley | Appointed to the Legislative Council |
| Restigouche | June 1885† | Joseph Cunard Barberie | William Murray | Appointed to the Legislative Council |
| Sunbury | January 9, 1885 | Arthur Glasier | Arthur Glasier | By-election results voided |
| Victoria | June 28, 1884 | Richard Tibbits | George Thomas Baird | Appointed Deputy Provincial Secretary |
| Sunbury | December 4, 1883 | George A. Sterling | Arthur Glasier | Death |
| Westmorland | October 13, 1883 | Pierre-Amand Landry | Amasa E. Killam | Resignation to contest a federal by-election |
| Saint John County & City | August 23, 1883 | William Elder | Alfred Augustus Stockton | Death |
| Saint John County & City | August 23, 1883 | David McLellan | David McLellan | Sought re-election upon appointment as Provincial Secretary |
| Charlotte | March 26, 1883† | James Mitchell | James Mitchell | Sought re-election upon appointment as Surveyor General |
| York | March 24, 1883 | Andrew George Blair | Andrew George Blair | Sought re-election upon appointment as Premier and Attorney General |
| Gloucester | March 21, 1883† | Patrick G. Ryan | Patrick G. Ryan | Sought re-election upon appointment as Chief Commissioner of Public Works |
| Saint John County & City | March 16, 1883† | William Elder | William Elder | Sought re-election upon appointment as Provincial Secretary |
| Saint John County & City | March 16, 1883† | Robert J. Ritchie | Robert J. Ritchie | Sought re-election upon appointment as Solicitor General |
| Westmorland | January 9, 1883 | Pierre-Amand Landry | Pierre-Amand Landry | Resignation to recontest over election petition |
| Westmorland | January 9, 1883 | Charles A. Black | Charles A. Black | Resignation to recontest over election petition |
| Westmorland | January 9, 1883 | Daniel Lionel Hanington | Daniel Lionel Hanington | Resignation to recontest over election petition |
| Westmorland | January 9, 1883 | John A. Humphrey | John A. Humphrey | Resignation to recontest over election petition |
| Madawaska | October 7, 1882† | Patrick Lynott | Mathias Nadeau | Resignation due to election petition |
| Kings | September 27, 1882 | Finnemore E. Morton | Finnemore E. Morton | Sought re-election upon appointment as Solicitor General |
| Kings | September 27, 1882 | John Herbert Crawford | Gabriel Flewelling | Death |
| Kent | September 25, 1882 | William Wheton | William Wheton | Resignation to recontest over election petition |
| Kent | September 25, 1882 | Olivier J. Leblanc | Olivier J. Leblanc | Resignation to recontest over election petition |
† Won by acclamation

## 24th New Brunswick Legislature 1878–1882

| By-election | Date | Incumbent | Winner | Cause |
| Sunbury | April 6, 1881 | John S. Covert | James S. White | Death |
| Kings | May 28, 1879 | John Herbert Crawford | John Herbert Crawford | Sought re-election upon appointment as Solicitor General |
| York | November 14, 1878 | Andrew George Blair | Andrew George Blair | Resignation to recontest over election petition |
| York | November 14, 1878 | Frederick P. Thompson | Frederick P. Thompson | Resignation to recontest over election petition |
| Westmorland | July 24, 1878† | Pierre-Amand Landry | Pierre-Amand Landry | Sought re-election upon appointment as Chief Commissioner of Public Works |
| Northumberland | July 24, 1878† | Michael Adams | Michael Adams | Sought re-election upon appointment as Surveyor General |
† Won by acclamation

## 23rd New Brunswick Legislature 1874–1878

| By-election | Date | Incumbent | Winner | Cause |
| Saint John City | January 19, 1877† | Robert Marshall | Robert Marshall | By-election results voided |
| Saint John City | November 18, 1876 | William H.A. Keans | Robert Marshall | Death |
| Gloucester | January 31, 1876 | Théotime Blanchard | Patrick G. Ryan | Appointed Inspector of Weights and Measures for Restigouche County |
| Albert | January 18, 1876 | Alexander Rogers | Alexander Rogers | By-election results voided |
| Albert | January 18, 1876 | James Ryan | James Ryan | By-election results voided |
| Albert | August 28, 1875 | Alexander Rogers | Alexander Rogers | Void Election |
| Albert | August 28, 1875 | James Ryan | James Ryan | Void Election |
| Saint John County & City | March 6, 1875 | Joseph Coram | William Elder | Death |
† Won by acclamation

## 22nd New Brunswick Legislature 1870–1874

| By-election | Date | Incumbent | Winner | Cause |
| Kent | December 24, 1873 | William Shand Caie | Henry O'Leary | Death |
| Carleton | November 4, 1873 | George W. White | David Irvine | Resignation to contest a federal by-election |
| Kings | October 24, 1873 | George Otty | James William Nowlan | Appointed a judge |
| Albert | August 16, 1873 | Rufus Palmer | Martin B. Palmer | Death |
| Charlotte | September 20, 1872 | John McAdam | John Cameron Brown | Resignation to contest the 1872 Federal Election |
| York | August 3, 1872† | George Luther Hathaway | John James Fraser | Death |
| Queens | June 21, 1872 | Gideon D. Bailey | Walter S. Butler | Appointed to the Legislative Council |
| Westmorland | February 24(?), 1872 | Joseph Lytle Moore | John A. Humphrey | Death |
| Westmorland | September 12, 1871 | Daniel Lionel Hanington | Daniel Lionel Hanington | By-election results voided |
| Queens | April 4, 1871 | Robert Thorne Babbit | Ebenezer Williams | Appointed Registrar of Deeds |
| Charlotte | March 16, 1871 | Benjamin Robert Stephenson | Benjamin Robert Stephenson | Sought re-election upon appointment as Surveyor General |
| York | March 10, 1871† | George Luther Hathaway | George Luther Hathaway | Sought re-election upon appointment as Premier and Provincial Secretary |
| Westmorland | December 26, 1870 | Bliss Botsford | Daniel Lionel Hanington | Appointed a judge |
| Restigouche | December 3, 1870 | Alexander C. DesBrisay | John Phillips | Resignation to contest a federal by-election |
| Carleton | October 26, 1870† | William Lindsay | William Lindsay | Sought re-election upon appointment as Surveyor General |
† Won by acclamation

## 21st New Brunswick Legislature 1866–1870

| By-election | Date | Incumbent | Winner | Cause |
| Northumberland | May 27, 1869 | William Moore Kelly | William Moore Kelly | Sought re-election upon appointment as Chief Commissioner of Public Works |
| Kings | March 8, 1869† | William P. Flewelling | William P. Flewelling | Sought re-election upon appointment as Surveyor General |
| Northumberland | February 20, 1869† | Jacob C. Gough | Jacob C. Gough | Resignation to contest a federal by-election |
| Kent | February 12, 1869 | Owen McInerney | Urbain Johnson | Appointed to the Legislative Council |
| Victoria | February 9, 1869 | Benjamin Beveridge | Charles A. Hammond | Appointed to the Legislative Council |
| York | November 1868 | John Pickard | William Hayden Needham | Resignation to contest a federal by-election |
| Carleton | November 14, 1868 | James Hartley | George W. White | Death |
| Sunbury | September 22, 1868 | John Glasier | John S. Covert | Appointed to the Senate |
| Saint John County & City | April 4, 1868† | Charles Nelson Skinner | John Waterbury Cudlip | Appointed a judge |
| Victoria | January 3, 1868 | Vital Hébert | Lévite Thériault | Death |
| Gloucester | January 1–6, 1868 | Robert Young | William Taylor | Appointed to the Legislative Council |
| Northumberland | October 22, 1867† | Richard Sutton | Richard Sutton | Sought re-election upon appointment as Surveyor General |
| York | October 19, 1867† | John Adolphus Beckwith | John Adolphus Beckwith | Sought re-election upon appointment as Provincial Secretary |
| Kings | October 19, 1867 | George Ryan | Gideon McLeod | Resignation to contest the 1867 Federal Election |
| Saint John City | October 16, 1867 | Samuel Leonard Tilley | William Keans | Resignation to contest the 1867 Federal Election |
| Saint John County & City | October 15, 1867 | John Hamilton Gray | Joseph Coram | Resignation to contest the 1867 Federal Election |
| Saint John County & City | October 15, 1867 | Robert Duncan Wilmot | George Edwin King | Appointed to the Senate |
| Westmorland | October 14, 1867† | Albert James Smith | Joseph Lytle Moore | Resignation to contest the 1867 Federal Election |
| Charlotte | October 10, 1867 | James Watson Chandler | Henry Frye | Appointed County Court judges |
| Charlotte | October 10, 1867 | James G. Stevens | Benjamin Robert Stephenson | Appointed County Court judges |
| Saint John City | October 4, 1867 | Andrew Rainsford Wetmore | Andrew Rainsford Wetmore | Sought re-election upon appointment as Attorney General |
| York | October 2, 1867 | Charles Fisher | John Pickard | Resignation to contest the 1867 Federal Election |
| Queens | September 23, 1867† | John Ferris | Walter S. Butler | Resignation to contest the 1867 Federal Election |
| Carleton | September 21, 1867 | Charles Connell | James Hartley | Resignation to contest the 1867 Federal Election |
| Albert | September 14, 1867 | Abner Reid McClelan | Charles Peck | Appointed to the Senate |
| Albert | September 14, 1867 | John Lewis | Amos Atkinson Bliss | Appointed to the Legislative Council |
| Restigouche | September 11, 1867 | John McMillan | William Montgomery | Resignation to contest the 1867 Federal Election |
| Saint John County & City | September 4, 1867† | Charles Nelson Skinner | Charles Nelson Skinner | Sought re-election upon appointment as Solicitor General |
| Northumberland | August 10, 1867† | John Mercer Johnson | William Moore Kelly | Resignation to contest the 1867 Federal Election |
| Northumberland | August 10, 1867† | Edward Williston | Jacob C. Gough | Appointed a County Court judge |
| Charlotte | July 1867† | John McAdam | John McAdam | Sought re-election upon appointment as Chief Commissioner of Public Works |
| Carleton | July 24, 1866† | Charles Connell | Charles Connell | Sought re-election upon appointment as Surveyor General |
† Won by acclamation

## 20th New Brunswick Legislature 1865–1866

| By-election | Date | Incumbent | Winner | Cause |
| York | November 6, 1865 | John Campbell Allen | Charles Fisher | Appointed to the Supreme Court |
| Westmorland | October 9, 1865† | Albert James Smith | Albert James Smith | Sought re-election upon appointment as Attorney General |
| Carleton | April 20, 1865† | Arthur Hill Gillmor | Arthur Hill Gillmor | Sought re-election upon appointment as Provincial Secretary |
| Westmorland | April 1865† | Bliss Botsford | Bliss Botsford | Sought re-election upon appointment as Surveyor General |
| York | April 17, 1865† | George Luther Hathaway | George Luther Hathaway | Sought re-election upon appointment as Chief Commissioner of Public Works |
| York | April 17, 1865† | John Campbell Allen | John Campbell Allen | Sought re-election upon appointment as Attorney General |
† Won by acclamation

## 19th New Brunswick Legislature 1861–1865

| By-election | Date | Incumbent | Winner | Cause |
| Northumberland | January 13, 1865 | Robinson Crocker | Richard Hutchison | Death |
| Charlotte | July 25, 1864 | George S. Grimmer | John McAdam | Appointed Clerk of the Peace |
| Carleton | June 23, 1864 | David Munro | Charles Connell | Appointed Registrar of Deeds |
| Queens | June 22, 1864 | Samuel H. Gilbert | Joseph B. Perkins | Death |
| Saint John County & City | March 18, 1863 | John Jordan | John Hamilton Gray | Death |
| Victoria | January 5, 1863 | David B. Raymond | Benjamin Beveridge | Death |
| Northumberland | October 28, 1862† | John Mercer Johnson | John Mercer Johnson | Sought re-election upon appointment as Attorney General |
| Restigouche | August 16, 1861 | John McMillan | John McMillan | Sought re-election upon appointment as Surveyor General |
| York | August 15, 1861 | George Luther Hathaway | George Luther Hathaway | Sought re-election upon appointment as Chief Commissioner of Public Works |
† Won by acclamation

## 18th New Brunswick Legislature 1857–1861

| By-election | Date | Incumbent | Winner | Cause |
| Westmorland | June 8, 1860† | James Steadman | James Steadman | Sought re-election upon appointment as Postmaster General |
| Carleton | November 15, 1858 | Charles Connell | Charles Connell | Sought re-election upon appointment as Postmaster General |
| Saint John City | July 14, 1858 | James A. Harding | Joseph Lawrence | Appointed Sheriff of Saint John |
| Westmorland | December 28, 1857 | Robert K. Gilbert | Daniel Hanington | Death |
| Northumberland | December 26, 1857 | Richard Sutton | Edward Williston | Sought re-election upon appointment as Deputy Treasurer of the port of Newcastle |
| Charlotte | July 1857 | James Brown | James Brown | Sought re-election upon appointment as Surveyor General |
| Northumberland | July 22, 1857† | John Mercer Johnson | John Mercer Johnson | Sought re-election upon appointment as Postmaster General |
| Victoria | July 18, 1857† | Charles Watters | Charles Watters | Sought re-election upon appointment as Solicitor General |
| Saint John City | July 6, 1857 | Samuel Leonard Tilley | Samuel Leonard Tilley | Sought re-election upon appointment as Provincial Secretary |
| York | June 13, 1857† | Charles Fisher | Charles Fisher | Sought re-election upon appointment as Premier and Attorney General |
† Won by acclamation

## 17th New Brunswick Legislature 1856–1857

| By-election | Date | Incumbent | Winner | Cause |
| York | September 1856† | Charles Macpherson | Charles Macpherson | Sought re-election upon appointment as Provincial Secretary |
| Restigouche | August 20, 1856† | John Montgomery | John Montgomery | Sought re-election upon appointment as Surveyor General |
† Won by acclamation

## 16th New Brunswick Legislature 1854–1856

| By-election | Date | Incumbent | Winner | Cause |
| York | February 28, 1856 | James Taylor | John Campbell Allen | Death |
| Saint John County & City | September 22, 1855 | John Richard Partelow | John F. Godard | Appointed Auditor General |
| Saint John County & City | September 22, 1855 | William Johnstone Ritchie | R. Sands Armstrong | Appointed to the Supreme Court |
| Victoria | September 10, 1855 | Francis Rice | Charles Watters | Appointed to the Legislative Council |
| Charlotte | December 1854 | James Brown | James Brown | Sought re-election upon appointment as Surveyor General |
| Saint John City | November 15, 1854† | Samuel Leonard Tilley | Samuel Leonard Tilley | Sought re-election upon appointment as Provincial Secretary |
| Northumberland | November 14, 1854† | John Mercer Johnson | John Mercer Johnson | Sought re-election upon appointment as Solicitor General |
| York | November 12, 1854† | Charles Fisher | Charles Fisher | Sought re-election upon appointment as Premier and Attorney General |
† Won by acclamation

## 15th New Brunswick Legislature 1850–1854

| By-election | Date | Incumbent | Winner | Cause |
| Westmorland | May 1853 | William Crane | Amand Landry | Death |
| Carleton | April 18, 1853 | Horace H. Beardsley | Charles Connell | Death |
| Saint John County & City | July 19, 1852 | John Johnston | John Jordan | Appointed Police Magistrate for Saint John |
| Northumberland | July 6, 1852 | Alexander Rankin | George Kerr | Death |
| Westmorland | May 18, 1852 | Robert B. Chapman | Albert James Smith | Void Election |
| Albert | January 1852 | William Steeves | John Lewis | Appointed to the Legislative Council |
| Queens | January 1852 | Thomas Gilbert | Samuel H. Gilbert | Appointed to the Legislative Council |
| Restigouche | November or December 1851 | Andrew Barberie | Andrew Barberie | Sought re-election upon appointment as Clerk of the Crown in the Supreme Court |
| Saint John City | November 15, 1851 | Samuel Leonard Tilley | James A. Harding | Resignation |
| Saint John County & City | November 14, 1851 | Charles Simonds | John F. Goddard | Resignation |
| Saint John County & City | November 11, 1851† | William Johnstone Ritchie | John Johnston | Resignation |
| Saint John County & City | October 18, 1851 | Robert Duncan Wilmot | Robert Duncan Wilmot | Sought re-election upon appointment as Surveyor-General |
| Gloucester | September 29, 1851 | Joseph Read | Joseph Read | Sought re-election upon appointment as Deputy Treasurer of Gloucester |
| Carleton | February 1851 | Charles Connell | Richard English | Appointed to the Legislative Council |
| York | February 1851 | Lemuel Allan Wilmot | Charles McPherson | Appointed a judge |
| Northumberland | February 16, 1851† | John Ambrose Street | John Ambrose Street | Sought re-election upon appointment as Attorney General |
† Won by acclamation

## 14th New Brunswick Legislature 1846–1850

| By-election | Date | Incumbent | Winner | Cause |
| Saint John City | March 6, 1849 | Robert Leonard Hazen | Barzilla Ansley | Appointed to the Legislative Council |
| Queens | March 1847 | Hugh Johnston | John Earle | Void Election |

## 13th New Brunswick Legislature 1843–1846

| By-election | Date | Incumbent | Winner | Cause |
| Kings | May 1844 | Samuel Freeze | William McLeod | Death |
| Northumberland | July 1843 | John T. Williston | John Ambrose Street | Void Election |
| York | June 1843† | Lemuel Allan Wilmot | Lemuel Allan Wilmot | Sought re-election upon appointment to the Executive Council |
| Saint John City | June 7, 1843† | Robert Leonard Hazen | Robert Leonard Hazen | Sought re-election upon appointment to the Executive Council |
† Won by acclamation

## 12th New Brunswick Legislature 1837–1842

| By-election | Date | Incumbent | Winner | Cause |
| Charlotte | November 1839 | Thomas Wyer | James Boyd | Appointed to the Legislative Council |
| Restigouche | November 5, 1838† | New Seat | Andrew Barberie | Restigouche County created |
† Won by acclamation

## 11th New Brunswick Legislature 1835–1837

| By-election | Date | Incumbent | Winner | Cause |
| York | January 1837 | Jedediah Slason | D. L. Robinson | Death |
| Westmorland | November–December 1836 | Edward Barron Chandler | William Wilson | Appointed to Legislative Council |

## 10th New Brunswick Legislature 1830–1834

| By-election | Date | Incumbent | Winner | Cause |
| York | June 16, 1834† | William Taylor | Lemuel Allan Wilmot | Death |
| Northumberland | February 28, 1833† | Joseph Cunard | John Ambrose Street | Appointed to Legislative Council |
| York | September 1832 | John Dow | Jeremiah Connell | Death |
| York | September 1832 | Jeremiah Connell | James Taylor | By-election results reversed March 1833 |
† Won by acclamation

## 9th New Brunswick Legislature 1827–1830

| By-election | Date | Incumbent | Winner | Cause |
| Northumberland | December 28, 1828 | Richard Simonds | Joseph Cunard | Appointed Provincial Treasurer |
| Queens | August 14–27, 1828 | Harry Peters | Thomas Gilbert | Appointed to the Council |

## 8th New Brunswick Legislature 1820–1827

| By-election | Date | Incumbent | Winner | Cause |
| Saint John County & City | February 2, 1826† | Ward Chipman | Robert Parker | Appointed a judge and to the Council |
| Westmorland | April 27, 1825 | Benjamin Wilson | Robert Scott | Death |
| Sunbury | March 1824 | William Wilmot | Samuel Nevers | Unseated for being a member of the clergy |
| Westmorland | March 2, 1824 | William Botsford | William Crane | Appointed a judge and to the Council |
| Sunbury | May 1823 | William Wilmot | William Wilmot | Unseated for being a member of the clergy |
| Sunbury | March 1823 | Amos Perley | William Wilmot | Death |
| Westmorland | March 19, 1822 | Joseph Crandall | Malcolm Wilmot | Unseated for being a member of the clergy |
| York | March 1, 1822 | Stair Agnew | Jedediah Slason | Death |
† Won by acclamation

## 7th New Brunswick Legislature 1819–1820

no by-elections

## 6th New Brunswick Legislature 1816–1819

| By-election | Date | Incumbent | Winner | Cause |
| Saint John City | May 12, 1818 | Stephen Humbert | Stephen Humbert | Expulsion for writing a newspaper editorial criticizing another member of the House. |
| Queens | August 10, 1817 | Richard Yeamans | Richard Yeamans | Void Election |

## 5th New Brunswick Legislature 1809–1816

| By-election | Date | Incumbent | Winner | Cause |
| York | January 26, 1814 | Duncan McLeod | John Murray Bliss | Death |
| Westmorland | February 24, 1813† | Amos Botsford | William Botsford | Death |
| Saint John City | November 7, 1810 | John Garrison | John Robinson | Death |
| Kings | March 1810 | John Coffin | Jasper Belding | Void Election |
| Kings | March 1810 | George Pitfield | George Leonard | Void Election |
† Won by acclamation

## 4th New Brunswick Legislature 1802–1809

| By-election | Date | Incumbent | Winner | Cause |
| Saint John County & City | November 9, 1803 | Edward Sands | Munson Jarvis | Void Election |
| Westmorland | November 1803 | Hugh McMonagle | Titus Knapp | Death |

## 3rd New Brunswick Legislature 1795–1802

| By-election | Date | Incumbent | Winner | Cause |
| Kings | May 1, 1801 | David Fanning | George Leonard | Expulsion following conviction for rape. |
| Charlotte | April 1799 | David Owen | Ninian Lindsay | Did not take seat |

## 2nd New Brunswick Legislature 1793–1795

no by-elections held

## 1st New Brunswick Legislature 1785–1792

| By-election | Date | Incumbent | Winner | Cause |
| Kings | March 2–12, 1791 | John Hamilton | David Fanning | Left the Province |
| York | February 25–26, 1791 | Edward Stelle | John Saunders | Left the Province |
| Northumberland | March 1791 | William Davidson | Harris William Hailes | Death |
| Saint John County & City | November 24-December 1, 1789 | Stanton Hazard | Nehemiah Rogers | Death |
| Sunbury | November 9, 1789 | Richard Vandeburg | James Glenie | Left the Province |
| Charlotte | November 1789 | William Paine | Colin Campbell | Left the Province |
| Kings | September 1788 | Ebenezer Foster | John Hamilton | Death |