{|class="wikitable sortable"
|-
! Senator !! Lifespan !! Party !! Prov. !! Entered !! Left !! Appointed by !! Left due to !! For life?
|-
| John Abbott || 1821–1893 || L || QC || 12 May 1887 || 30 October 1893 || Macdonald || Death || Y
|-
| Michael Adams || 1845–1899 || C || NB || 7 January 1896 || 1 January 1899 || Bowell || Death || Y
|-
| Willie Adams || 1934–present|| L || NT<br>NU || 5 April 1977<br>September 2, 1999 || September 2, 1999<br>22 June 2009 || Trudeau, P. || Retirement ||
|-
| Charles Adler || 1954–present || || MB || 16 August 2024 || — || Trudeau, J. || — ||
|-
| James Cox Aikins || 1823–1904 || LC || ON || 23 October 1867<br>7 January 1896 || 30 May 1882<br>6 August 1904 || Royal proclamation<br>Bowell || Resignation<br>Death || Y
|-
| John Black Aird || 1923–1995 || L || ON || 10 November 1964 || 28 November 1974 || Pearson || Resignation || Y
|-
| George Alexander || 1814–1903 || C || ON || 30 May 1873 || 29 May 1891 || Macdonald || Resignation || Y
|-
| George William Allan || 1822–1901 || C || ON || 23 October 1867 || 24 July 1901 || Royal proclamation || Death || Y
|-
| William Johnston Almon || 1816–1901 || LC || NS || 15 April 1879 || 18 February 1901 || Macdonald || Death || Y
|-
| Doris Margaret Anderson || 1922–2022 || L || PE || 21 September 1995 || 5 July 1997 || Chrétien || Retirement ||
|-
| John Hawkins Anderson || 1805–1870 || L || NS || 23 October 1867 || 24 December 1870 || Royal proclamation || Death || Y
|-
| Margaret Dawn Anderson || 1967–present|| || NT || 12 December 2018 || — || Trudeau, J. || — ||
|-
| Margaret Jean Anderson || 1915–2003 || L || NB || 23 March 1978 || 7 August 1990 || Trudeau, P. || Retirement ||
|-
| Raynell Andreychuk || 1944–present|| C || SK || 11 March 1993 || 14 August 2019 || Mulroney || — ||
|-
| Auguste-Réal Angers || 1837–1919 || C || QC || 16 December 1892 || 10 June 1896 || Thompson || Resignation || Y
|-
| W. David Angus || 1937–present|| C || QC || 10 June 1993 || 21 July 2012 || Mulroney || Retirement ||
|-
| Thomas Dickson Archibald || 1813–1890 || LC || NS || 23 October 1867 || 18 October 1890 || Royal proclamation || Death || Y
|-
| Hazen Argue || 1921–1991 || L || SK || 24 February 1966 || 2 October 1991 || Pearson || Death ||
|-
| Joseph-François Armand || 1820–1903 || C || QC || 23 October 1867 || 1 January 1903 || Royal proclamation || Death || Y
|-
| David Arnot || 1952–present|| || SK || 29 July 2021 || — || Trudeau, J. || — ||
|-
| Joseph-Octave Arsenault || 1828–1897 || C || PE || 18 February 1895 || 14 December 1897 || Bowell || Death || Y
|-
| James Arthurs || 1866–1937 || C || ON || 20 July 1935 || 7 October 1937 || Bennett || Death || Y
|-
| Walter Aseltine || 1886–1971 || C || SK || 30 December 1933 || 31 March 1971 || Bennett || Resignation || Y
|-
| Martial Asselin || 1924–2013 || PC || QC || 1 September 1972 || 7 August 1990 || Trudeau, P. || Resignation ||
|-
| Salma Ataullahjan || 1952–present|| C || ON || 9 July 2010 || — || Harper || — ||
|-
| Norman Atkins || 1934–2010 || PC || ON || 2 July 1986 || 27 June 2009 || Mulroney || Retirement ||
|-
| Réjean Aucoin || 1955–present || || NS || 31 October 2023 || — || Trudeau, J. || — ||
|-
| Michèle Audette || 1971–present|| || QC || 29 July 2021 || — || Trudeau, J. || — ||
|-
| Jack Austin || 1932–present|| L || BC || 19 August 1975 || 2 March 2007 || Trudeau, P. || Retirement ||
|-
| Allen Bristol Aylesworth || 1854–1952 || L || ON || 11 January 1923 || 13 February 1952 || King || Death || Y
|}