| Senator | Lifespan | Party [1] | Prov. | Entered | Left | Appointed by | Left due to | For life? |
|---|---|---|---|---|---|---|---|---|
| Henry Kaulback | 1830–1896 | C | NS | 27 March 1872 | 8 January 1896 | Macdonald | Death | Y |
| Judith Keating | 1957–2021 | NB | 30 January 2020 | 15 July 2021 | Trudeau, J. | Death | ||
| James Kelleher | 1930–2013 | C | ON | 23 September 1990 | 2 October 2005 | Mulroney | Retirement | |
| William McDonough Kelly | 1925–2013 | PC | ON | 23 December 1982 | 21 July 2000 | Trudeau, P. | Retirement | |
| Albert Edward Kemp | 1858–1929 | C | ON | 4 November 1921 | 12 August 1929 | Meighen | Death | Y |
| Betty Kennedy | 1926–2017 | L | ON | 20 June 2000 | 4 January 2001 | Chrétien | Retirement | |
| Colin Kenny | 1943–present | L | ON | 29 June 1984 | 2 February 2018 | Trudeau, P. | Resignation | |
| Edward Kenny | 1800–1891 | C | NS | 23 October 1867 | 11 April 1876 | Royal proclamation | Resignation | Y |
| Wilbert Keon | 1935–2019 | C | ON | 27 September 1990 | 17 May 2010 | Mulroney | Retirement | |
| James Kirkpatrick Kerr | 1841–1916 | L | ON | 12 March 1903 | 4 December 1916 | Laurier | Death | Y |
| William Kerr | 1836–1906 | L | ON | 15 March 1899 | 22 November 1906 | Laurier | Death | Y |
| Thomas Joseph Kickham | 1901–1974 | L | PE | 8 July 1966 | 1 December 1974 | Pearson | Death | |
| George Gerald King | 1836–1928 | L | NB | 18 December 1896 | 28 April 1928 | Laurier | Death | Y |
| James Horace King | 1873–1955 | L | BC | 7 June 1930 | 14 July 1955 | King | Death | Y |
| Joan Kingston | 1955–present | NB | 31 October 2023 | — | Trudeau, J. | — | ||
| John James Kinley | 1881–1971 | L | NS | 18 April 1945 | 12 June 1971 | King | Resignation | Y |
| Mary Elizabeth Kinnear | 1898–1991 | L | ON | 6 April 1967 | 3 April 1973 | Pearson | Retirement | |
| Noël Kinsella | 1939–2023 | C | NB | 12 September 1990 | 26 November 2014 | Mulroney | Retirement | |
| Michael J. L. Kirby | 1941–present | L | NS | 13 January 1984 | 31 October 2006 | Trudeau, P. | Resignation | |
| John Nesbitt Kirchhoffer | 1848–1914 | C | MB | 16 December 1892 | 22 December 1914 | Thompson | Death | Y |
| Marty Klyne | 1957–present | SK | 24 September 2018 | — | Trudeau, J. | — | ||
| Adrian Knatchbull-Hugessen | 1891–1976 | L | QC | 12 January 1937 | 1 January 1967 | King | Voluntary retirement | Y |
| Vim Kochhar | 1936–present | C | ON | 29 January 2010 | 21 September 2011 | Harper | Retirement | |
| Leo Kolber | 1929–2020 | L | QC | 23 December 1983 | 18 January 2004 | Trudeau, P. | Retirement | |
| Richard Kroft | 1938–present | L | MB | 11 June 1998 | 24 September 2004 | Chrétien | Resignation | |
| Stan Kutcher | 1951–present | NS | 12 December 2018 | — | Trudeau, J. | — |