title: List of members of the Senate of Canada (O)
text: # List of members of the Senate of Canada (O)
  
  ## List of members of the Senate of Canada
  
  * A
  * B
  * C
  * D
  * E
  * F
  * G
  * H
  * I
  * J
  * K
  * L
  * M
  * N
  * O
  * P
  * Q
  * R
  * S
  * T
  * U
  * V
  * W
  * X
  * Y
  * Z
  
  | Senator | Lifespan | Party | Prov. | Entered | Left | Appointed by | Left due to | For life? |
  | - | - | - | - | - | - | - | - | - |
  | James O'Brien | 1836–1903 | LC | QC | 2 January 1896 | 28 May 1903 | Bowell | Death | Y |
  | Michael John O'Brien | 1851–1940 | C | ON | 1 September 1918 | 1 September 1925 | Borden | Resignation | Y |
  | Frank Patrick O'Connor | 1885–1939 | C | ON | 6 December 1935 | 21 August 1939 | King | Death | Y |
  | William Hunter Odell | 1811–1891 | C | NB | 23 October 1867 | 25 July 1891 | Royal proclamation | Death | Y |
  | John O'Donohoe | 1824–1902 | LC | ON | 21 May 1882 | 7 December 1902 | Macdonald | Death | Y |
  | Kelvin Ogilvie | 1942–present | C | NS | 27 August 2009 | 6 November 2017 | Harper | Retirement | |
  | Victor Oh | 1949–present | C | ON | 25 January 2013 | — | Harper | — | |
  | Clement O'Leary | 1916–1969 | PC | NS | 25 September 1962 | 12 June 1969 | Diefenbaker | Death | Y |
  | Grattan O'Leary | 1888–1976 | PC | ON | 24 September 1962 | 7 April 1976 | Diefenbaker | Death | Y |
  | Alexander Walker Ogilvie | 1829–1902 | C | QC | 24 December 1881 | 18 January 1901 | Macdonald | Resignation | Y |
  | Donald Oliver | 1938–present | C | NS | 7 September 1990 | 16 November 2013 | Mulroney | Retirement | |
  | Louis Auguste Olivier | 1816–1881 | C | QC | 23 October 1867 | 8 September 1873 | Royal proclamation | Resignation | Y |
  | Bud Olson | 1925–2002 | C | AB | 5 April 1977 | 7 March 1996 | Trudeau, P. | Resignation | |
  | Ratna Omidvar | 1950–present | NA | ON | 1 April 2016 | — | Trudeau, J. | — | |
  | Gerry Ottenheimer | 1934–1998 | PC | NL | 30 December 1987 | 18 January 1998 | Mulroney | Death | |
  | William Owens | 1840–1917 | C | QC | 2 January 1896 | 8 June 1917 | Bowell | Death | Y |
  
  * ↑ C=Conservative, L=Liberal, LC=Liberal-Conservative, PC=Progressive Conservative.
  