# By-elections to the 6th Canadian Parliament

By-elections to the 6th Canadian Parliament were held to elect members of the House of Commons of Canada between the 1887 federal election and the 1891 federal election. The Conservative Party of Canada led a majority government for the 6th Canadian Parliament.
The list includes Ministerial by-elections which occurred due to the requirement that Members of Parliament recontest their seats upon being appointed to Cabinet. These by-elections were almost always uncontested. This requirement was abolished in 1931.
| By-election | Date | Incumbent | Party | Winner | Party | Cause | Retained |
| Victoria South | December 18, 1890 | Adam Hudspeth | Conservative | Charles Fairbairn | Liberal-Conservative | Death | Yes |
| Napierville | December 9, 1890 | Louis Sainte-Marie | Liberal | François-Xavier Paradis | Conservative | Resigned to enter provincial politics in Quebec. | No |
| Kent | July 31, 1890 | Pierre-Amand Landry | Conservative | Édouard H. Léger | Conservative | Appointed a judge in the county court of Westmorland and Kent. | Yes |
| Montmorency | July 25, 1890 | Charles Langelier | Liberal | Louis-Georges Desjardins | Conservative | Resignation to enter provincial politics in Quebec. | No |
| New Westminster | June 19, 1890 | Donald Chisholm | Conservative | Gordon Edward Corbould | Conservative | Death | Yes |
| Lincoln and Niagara | May 23, 1890 | John Charles Rykert | Conservative | John Charles Rykert | Conservative | Resignation to recontest over charges of corruption. | Yes |
| Ottawa (City of) (electoral district) | April 26, 1890 | William Goodhue Perley | Conservative | Charles Herbert Mackintosh | Conservative | Death | Yes |
| Haldimand | February 20, 1890 | Charles Wesley Colter | Liberal | Walter Humphries Montague | Conservative | Election declared void. | No |
| Stanstead | December 18, 1889 | Charles Carroll Colby | Liberal-Conservative | Charles Carroll Colby | Liberal-Conservative | Recontested upon appointment as President of the Privy Council. | Yes |
| Victoria | October 28, 1889 | Edgar Crow Baker | Conservative | Thomas Earle | Conservative | Resignation. | Yes |
| Compton | May 16, 1889 | John Henry Pope | Liberal-Conservative | Rufus Henry Pope | Conservative | Death | Yes |
| Haldimand | January 30, 1889 | Walter Humphries Montague | Conservative | Charles Wesley Colter | Liberal | Election declared void. | No |
| Provencher | January 24, 1889 | Joseph Royal | Conservative | Alphonse Alfred Clément Larivière | Conservative | Appointed Lieutenant-Governor of the North West Territories. | Yes |
| Joliette | January 16, 1889 | Édouard Guilbault | Conservative | Hilaire Neveu | Nationalist | Election declared void. | No |
| Cumberland | December 26, 1888 | Arthur Rupert Dickey | Conservative | Arthur Rupert Dickey | Conservative | Election declared void. | Yes |
| Cariboo | November 22, 1888 | James Reid | Liberal-Conservative | Francis Stillman Barnard | Conservative | Called to the Senate. | Yes |
| Northumberland East | November 21, 1888 | Edward Cochrane | Conservative | Edward Cochrane | Conservative | Election declared void. | Yes |
| Shelburne | October 22, 1888 | John Wimburne Laurie | Conservative | John Wimburne Laurie | Conservative | Election declared void. | Yes |
| Cardwell | October 3, 1888 | Thomas White | Conservative | Robert Smeaton White | Conservative | Death | Yes |
| Montreal East | September 26, 1888 | Charles-Joseph Coursol | Conservative | Alphonse-Télesphore Lépine | Independent Conservative | Death | No |
| Assiniboia East | September 12, 1888 | William Dell Perley | Conservative | Edgar Dewdney | Conservative | Called to the Senate | Yes |
| Halton | August 22, 1888 | John Waldie | Conservative | David Henderson | Conservative | Election declared void. | No |
| Lanark South | August 15, 1888 | John Graham Haggart | Liberal | John Graham Haggart | Conservative | Recontested upon appointment as Postmaster-General. | Yes |
| Colchester | August 15, 1888 | Archibald McLelan | Conservative | Adams George Archibald | Liberal-Conservative | Appointed Lieutenant-Governor of Nova Scotia. | Yes |
| Nicolet | July 17, 1888 | Athanase Gaudet | Nationalist Conservative | Fabien Boisvert | Independent Conservative | Death | No |
| Cumberland | July 13, 1888 | Charles Tupper | Conservative | Arthur Rupert Dickey | Conservative | Appointed Canadian High Commissioner to the United Kingdom. | Yes |
| Pictou | June 18, 1888 | Charles Hibbert Tupper | Conservative | Charles Hibbert Tupper | Conservative | Recontested upon appointment as Minister of Marine and Fisheries. | Yes |
| Russell | May 7, 1888 | William C. Edwards | Liberal | William C. Edwards | Liberal | Election declared void. | Yes |
| Kent | May 2, 1888 | Archibald Campbell | Liberal | Archibald Campbell | Liberal | Election declared void. | Yes |
| L'Assomption | April 3, 1888 | Joseph Gauthier | Liberal | Joseph Gauthier | Liberal | Election declared void. | Yes |
| Missisquoi | March 27, 1888 | George Clayes | Liberal | Daniel Bishop Meigs | Liberal | Death | Yes |
| Prince Edward | March 19, 1888 | John Milton Platt | Liberal | John Milton Platt | Liberal | Election declared void. | Yes |
| Hastings West | March 17, 1888 | Alexander Robertson | Conservative | Henry Corby, Jr. | Conservative | Death | Yes |
| Middlesex West | March 10, 1888 | William Frederick Roome | Conservative | William Frederick Roome | Conservative | Election declared void. | Yes |
| Halton | February 7, 1888 | John Waldie | Liberal | David Henderson | Conservative | Election declared void. | No |
| Carleton | February 1, 1888 | John A. Macdonald | Liberal-Conservative | George Lemuel Dickinson | Conservative | Chose to sit for Kingston. | Yes |
| Victoria | January 23, 1888 | Noah Shakespeare | Conservative | Edward Gawler Prior | Conservative | Appointed Postmaster of Victoria. | Yes |
| Queen's | January 18, 1888 | George Gerald King | Liberal | George Frederick Baird | Conservative | Election declared void. | No |
| Dorchester | January 7, 1888 | Henri Jules Juchereau Duchesnay | Nationalist Conservative | Honoré-Julien-Jean-Baptiste Chouinard | Conservative | Death | No |
| Northumberland East | December 22, 1887 | Albert Mallory | Liberal | Edward Cochrane | Conservative | Election declared void. | No |
| Shelburne | December 15, 1887 | Thomas Robertson | Liberal | John Wimburne Laurie | Conservative | Election declared void. | No |
| Yarmouth | December 15, 1887 | John Lovitt | Liberal | John Lovitt | Liberal | Election declared void. | Yes |
| Victoria | November 21, 1887 | Charles James Campbell | Conservative | John Archibald McDonald | Liberal | Election declared void. | No |
| Haldimand | November 12, 1887 | Walter Humphries Montague | Conservative | Walter Humphries Montague | Conservative | Election declared void. | Yes |
| Cumberland | November 9, 1887 | Charles Tupper | Conservative | Charles Tupper | Conservative | Election declared void. | Yes |
| Colchester | October 27, 1887 | Archibald McLelan | Conservative | Archibald McLelan | Conservative | Election declared void. | Yes |
| Bruce West | October 19, 1887 | Edward Blake | Liberal | James Rowand | Liberal | Chose to sit for Durham West. | Yes |
| Richelieu | October 18, 1887 | Jean-Baptiste Labelle | Conservative | Joseph-Aimé Massue | Conservative | Death | Yes |
| Charlevoix | September 28, 1887 | Simon-Xavier Cimon | Conservative | Simon Cimon | Conservative | Death | Yes |
| Renfrew South | August 2, 1887 | Robert Campbell | Liberal | John Ferguson | Independent | Death | No |
| Digby | July 16, 1887 | John Campbell | Conservative | Herbert Ladd Jones | Conservative | Death | Yes |
| Restigouche | May 21, 1887 | Robert Moffat | Conservative | George Moffat Jr. | Conservative | Death | Yes |
| Victoria South | April 20, 1887 | Adam Hudspeth | Conservative | Adam Hudspeth | Liberal-Conservative | Seeks re-election due to holding the office of revising officer. | Yes |
| Bruce East | April 2, 1887 | Henry Cargill | Conservative | Henry Cargill | Conservative | Seeks re-election due to holding the position of postmaster. | Yes |