{|class="wikitable sortable"
|-
! Senator !! Lifespan !! Party !! Prov. !! Entered !! Left !! Appointed by !! Left due to !! For life?
|-
| David Ovide L'Espérance || 1864–1941 || C || QC || 26 July 1917 || 31 August 1941 || Borden || Death || Y
|-
| Patti LaBoucane-Benson || 1969–present|| || AB || 3 October 2018 || — || Trudeau, J. || — ||
|-
| Joseph-Henri-Gustave Lacasse || 1890–1953 || L || ON || 10 January 1928 || 18 January 1953 || King || Death || Y
|-
| Alexandre Lacoste || 1842–1923 || C || QC || 11 January 1884 || 13 September 1891 || Macdonald || Resignation || Y
|-
|| Louis Lacoste || 1798–1878 || C || QC || 23 October 1867 || 26 November 1878 || Royal proclamation || Death || Y
|-
| Napoléon Kemner Laflamme || 1865–1929 || L || QC || 21 December 1927 || 10 August 1929 || King || Death || Y
|-
| Paul Lafond || 1919–1988 || L || QC || 7 October 1970 || 7 May 1988 || Trudeau, P. || Death ||
|-
| Arthur Laing || 1904–1975 || L || BC || 1 September 1972 || 3 February 1975 || Trudeau, P. || Death ||
|-
| Henry Laird || 1868–1940 || C || SK || 31 January 1917 || 30 September 1940 || Borden || Death || Y
|-
| John Keith McBroom Laird || 1907–1985 || L || ON || 6 April 1967 || 12 January 1982 || Pearson || Retirement ||
|-
| Norman Platt Lambert || 1885–1965 || L || ON || 20 January 1938 || 4 November 1965 || King || Death || Y
|-
| Maurice Lamontagne || 1917–1983 || L || QC || 6 April 1967 || 12 June 1983 || Pearson || Death ||
|-
| George Landerkin || 1839–1903 || L || ON || 16 February 1901 || 4 October 1903 || Laurier || Death || Y
|-
| Auguste Landry || 1846–1919 || C || QC || 23 February 1892 || 20 December 1919 || Abbott || Death || Y
|-
| Joseph P. Landry || 1922–2008 || L || NB || 26 February 1996 || 19 June 1997 || Chrétien || Retirement ||
|-
| Daniel Lang || 1919–1997 || L || ON || 14 February 1964 || 13 June 1994 || Pearson || Voluntary retirement || Y
|-
| Daniel Lang || 1948–present|| C || YT || 2 January 2009 || 15 August 2017 || Harper || Resignation ||
|-
| Léopold Langlois || 1913–1996 || L || QC || 8 July 1966 || 2 October 1988 || Pearson || Retirement ||
|-
| Frances Lankin || 1954–present|| NA || ON || 1 April 2016 || 21 October 2024 || Trudeau, J. || Retirement ||
|-
| Laurier LaPierre || 1929–2012 || L || ON || 13 June 2001 || 21 November 2004 || Chrétien || Retirement ||
|-
| Jean Lapointe || 1935–2022 || L || QC || 13 June 2001 || 6 December 2010|| Chrétien || Retirement ||
|-
| Renaude Lapointe || 1912–2002 || L || QC || 10 November 1971 || 3 January 1987 || Trudeau, P. || Retirement ||
|-
| Alphonse Alfred Clément Larivière || 1842–1925 || C || MB || 23 October 1911 || 1 September 1917 || Borden || Resignation || Y
|-
| Louis Lavergne || 1845–1931 || L || QC || 13 October 1910 || 1 January 1930 || Laurier || Resignation || Y
|-
| Raymond Lavigne || 1945–present|| L || QC || 26 March 2002 || 21 March 2011 || Chrétien || Resignation ||
|-
| Thérèse Lavoie-Roux || 1928–2009 || PC || QC || 27 September 1990 || 12 March 2001 || Mulroney || Resignation ||
|-
| Edward M. Lawson || 1929–2016 || I || BC || 7 October 1970 || 24 September 2004 || Trudeau, P. || Retirement ||
|-
| Jean Le Moyne || 1913–1996 || L || QC || 23 December 1982 || 17 February 1988 || Trudeau, P. || Retirement ||
|-
| Fernand Leblanc || 1917–1996 || L || QC || 27 March 1979 || 1 July 1992 || Trudeau, P. || Retirement ||
|-
| Roméo LeBlanc || 1927–2009 || L || NB || 29 June 1984 || 21 November 1994 || Trudeau, P. || Resignation ||
|-
| Marjory LeBreton || 1940–present|| C || ON || 18 June 1993 || 4 July 2015 || Mulroney || Retirement ||
|-
| Thomas Lefebvre || 1927–1992 || L || QC || 9 July 1984 || 20 November 1992 || Turner || Death ||
|-
| J.-Eugène Lefrançois || 1896–1979 || L || QC || 25 April 1957 || 5 November 1976 || St. Laurent || Resignation || Y
|-
| Antoine Joseph Léger || 1880–1950 || C || NB || 14 August 1935 || 7 April 1950 || Bennett || Death || Y
|-
| Aurel Léger || 1894–1961 || L || NB || 12 June 1953 || 28 December 1961 || St. Laurent || Death || Y
|-
| Viola Léger || 1930–2023 || L || NB || 13 June 2001 || 29 June 2005 || Chrétien || Retirement ||
|-
| Joseph-Hormisdas Legris || 1850–1932 || L || QC || 10 February 1903 || 6 March 1932 || Laurier || Death || Y
|-
| Rodolphe Lemieux || 1866–1937 || L || QC || 3 June 1930 || 28 September 1937 || King || Death || Y
|-
| Elijah Leonard || 1814–1891 || L || ON || 23 October 1867 || 14 May 1891 || Royal proclamation || Death || Y
|-
| Thomas D'Arcy Leonard || 1895–1977 || L || ON || 28 July 1955 || 9 April 1970 || St. Laurent || Voluntary retirement || Y
|-
| Joseph Arthur Lesage || 1881–1950 || L || QC || 3 March 1944 || 9 March 1950 || King || Death || Y
|-
| James Leslie || 1786–1873 || C || QC || 23 October 1867 || 6 December 1873 || Royal proclamation || Death || Y
|-
| Prosper-Edmond Lessard || 1873–1931 || L || AB || 5 September 1925 || 11 April 1931 || King || Death || Y
|-
| Luc Letellier de St-Just || 1820–1881 || NL || QC || 23 October 1867 || 15 December 1876 || Royal proclamation || Resignation || Y
|-
| James Davies Lewin || 1812–1900 || L || NB || 10 November 1876 || 11 March 1900 || Mackenzie || Death || Y
|-
| John Lewis || 1858–1935 || L || ON || 5 September 1925 || 18 May 1935 || King || Death || Y
|-
| Philip D. Lewis || 1924–2017 || L || NL || 23 March 1978 || 28 November 1999 || Trudeau, P. || Retirement ||
|-
| Edgar Sydney Little || 1885–1943 || L || ON || 10 January 1928 || 22 December 1943 || King || Death || Y
|-
| John Locke || 1825–1873 || L || NS || 23 October 1867 || 12 December 1873 || Royal proclamation || Death || Y
|-
| Tony Loffreda || 1962–present|| || QC || 22 July 2019 || — || Trudeau, J. || — ||
|-
| Hance James Logan || 1869–1944 || L || NS || 5 February 1929 || 26 December 1944 || King || Death || Y
|-
| Rose-Marie Losier-Cool || 1937–present|| L || NB || 21 March 1995 || 18 June 2012 || Chrétien || Retirement ||
|-
| James Alexander Lougheed || 1854–1925 || LC || NT<br>AB || 10 December 1889<br>1 September 1905 || 1 September 1905<br>2 November 1925 || Macdonald || Death || Y
|-
| Sandra Lovelace Nicholas || 1948–present|| L || NB || 21 September 2005 || 31 January 2023 || Martin || Resignation ||
|-
| John Lovitt || 1832–1908 || L || NS || 18 December 1896 || 13 April 1908 || Laurier || Death || Y
|-
| Paul Lucier || 1930–1999 || L || YT || 23 October 1975 || 23 July 1999 || Trudeau, P. || Death ||
|-
| George Lynch-Staunton || 1858–1940 || C || ON || 20 January 1917 || 19 March 1940 || Borden || Death || Y
|-
| John Lynch-Staunton || 1930–2012 || C || QC || 23 September 1990 || 19 June 2005 || Mulroney || Retirement ||
|}