| Date | Name | Province | Affiliation before | Affiliation after | Reason | ||
|---|---|---|---|---|---|---|---|
| November 19, 2015 | John Wallace | New Brunswick | Conservative | Non-affiliated | Resigned from Conservative caucus | ||
| December 3, 2015 | Jacques Demers | Quebec | Conservative | Non-affiliated | Resigned from Conservative caucus | ||
| December 7, 2015 | George Furey | Newfoundland and Labrador | Senate Liberal | Non-affiliated | Resigned from Senate Liberal caucus | ||
| February 2, 2016 | Pierrette Ringuette | New Brunswick | Senate Liberal | Non-affiliated | Resigned from Senate Liberal caucus | ||
| February 10, 2016 | Irving Gerstein | Ontario | Conservative | vacant | Mandatory retirement | ||
| February 17, 2016 | Elaine McCoy | Alberta | Ind. Progressive Conservative | Non-affiliated | Redesignated from Independent Progressive Conservative | ||
| March 1, 2016 | Maria Chaput | Manitoba | Senate Liberal | vacant | Resigned from Senate | ||
| March 7, 2016 | Michel Rivard | Quebec | Conservative | Non-affiliated | Resigned from Conservative caucus | ||
| March 8, 2016 | Diane Bellemare | Quebec | Conservative | Non-affiliated | Resigned from Conservative caucus | ||
| March 23, 2016 | Peter Harder | Ontario | vacant | Non-affiliated | Appointed to Senate | ||
| April 1, 2016 | Raymonde Gagné | Manitoba | |||||
| Frances Lankin | Ontario | ||||||
| Ratna Omidvar | |||||||
| Chantal Petitclerc | Quebec | ||||||
| André Pratte | |||||||
| April 2, 2016 | Murray Sinclair | Manitoba | |||||
| April 6, 2016 | Larry Campbell | British Columbia | Senate Liberal | Non-affiliated | Resigned from Senate Liberal caucus | ||
| April 22, 2016 | Céline Hervieux-Payette | Quebec | Senate Liberal | vacant | Mandatory retirement | ||
| May 2, 2016 | Grant Mitchell | Alberta | Senate Liberal | Non-affiliated | Resigned from Senate Liberal caucus | ||
| May 5, 2016 | Nick Sibbeston | Northwest Territories | Senate Liberal | Non-affiliated | Resigned from Senate Liberal caucus | ||
| May 16, 2016 | David Smith | Ontario | Senate Liberal | vacant | Mandatory retirement | ||
| July 14, 2016 | Doug Black | Alberta | Conservative | Non-affiliated | Resigned from Conservative caucus | ||
| August 7, 2016 | Michel Rivard | Quebec | Non-affiliated | vacant | Mandatory retirement | ||
| September 27, 2016 | Janis Johnson | Manitoba | Conservative | vacant | Resigned from Senate | ||
| November 10, 2016 | Nancy Hartling | New Brunswick | vacant | Non-affiliated | Appointed to Senate | ||
| Wanda Thomas Bernard | Nova Scotia | ||||||
| Gwen Boniface | Ontario | ||||||
| Tony Dean | |||||||
| Sabi Marwah | |||||||
| Lucie Moncion | |||||||
| Kim Pate | |||||||
| Howard Wetston | |||||||
| Patricia Bovey | Manitoba | ||||||
| René Cormier | |||||||
| Marilou McPhedran | |||||||
| Renée Dupuis | Quebec | ||||||
| Diane Griffin | Prince Edward Island | ||||||
| Yuen Pau Woo | British Columbia | ||||||
| November 21, 2016 | Éric Forest | Quebec | |||||
| November 22, 2016 | Pierre-Hugues Boisvenu | Quebec | Non-affiliated | Conservative | Rejoined Conservative caucus | ||
| November 25, 2016 | Marc Gold | Quebec | vacant | Non-affiliated | Appointed to Senate | ||
| Marie-Françoise Mégie | |||||||
| Raymonde Saint Germain | |||||||
| December 2, 2016 | 33 Non-affiliated senators | Various | Non-affiliated | ISG | Formation of Independent Senators Group | ||
| December 6, 2016 | Daniel Christmas | Nova Scotia | vacant | Non-affiliated | Appointed to Senate | ||
| Rosa Galvez | Quebec | ||||||
| December 16, 2016 | Daniel Christmas | Nova Scotia | Non-affiliated | ISG | Redesignated from non-affiliated | ||
| Rosa Galvez | Quebec | ||||||
| January 6, 2017 | Nancy Ruth | Ontario | Conservative | vacant | Mandatory retirement | ||
| January 14, 2017 | Wilfred P. Moore | Nova Scotia | Senate Liberal | vacant | Mandatory retirement | ||
| January 22, 2017 | Jim Cowan | Nova Scotia | Senate Liberal | vacant | Mandatory retirement | ||
| January 31, 2017 | Josée Verner | Quebec | Conservative | Non-affiliated | Resigned from Conservative caucus | ||
| February 1, 2017 | John D. Wallace | New Brunswick | Non-affiliated | vacant | Resigned from Senate | ||
| March 10, 2017 | Don Meredith | Ontario | ISG | Non-affiliated | Resigned from Independent Senators Group | ||
| Anne Cools | Non-affiliated | ISG | Redesignated from non-affiliated | ||||
| March 30, 2017 | Wanda Bernard | Nova Scotia | Non-affiliated | ISG | Redesignated from non-affiliated | ||
| March 31, 2017 | Pana Merchant | Saskatchewan | Senate Liberal | vacant | Resigned from Senate | ||
| May 10, 2017 | Don Meredith | Ontario | Non-affiliated | vacant | Resigned from Senate | ||
| May 16, 2017 | Stephen Greene | Nova Scotia | Conservative | Non-affiliated | Removed from Conservative caucus | ||
| August 10, 2017 | Bob Runciman | Ontario | Conservative | vacant | Mandatory retirement | ||
| August 15, 2017 | Daniel Lang | Yukon | Conservative | vacant | Resigned from Senate | ||
| August 30, 2017 | David Adams Richards | New Brunswick | vacant | Non-affiliated | Appointed to Senate | ||
| September 4, 2017 | George Baker | Newfoundland and Labrador | Senate Liberal | vacant | Mandatory retirement | ||
| September 8, 2017 | Elizabeth Hubley | Prince Edward Island | Senate Liberal | vacant | Mandatory retirement | ||
| September 28, 2017 | David Adams Richards | New Brunswick | Non-affiliated | ISG | Redesignated from non-affiliated | ||
| October 17, 2017 | Josée Verner | Quebec | |||||
| October 24, 2017 | Stephen Greene | Nova Scotia | |||||
| October 30, 2017 | Paul Massicotte | Quebec | |||||
| November 6, 2017 | Kelvin Ogilvie | Nova Scotia | Conservative | vacant | Mandatory retirement | ||
| November 16, 2017 | Tobias Enverga | Ontario | Conservative | vacant | Death | ||
| November 21, 2017 | Nick Sibbeston | Northwest Territories | Non-affiliated | vacant | Resigned from Senate | ||
| December 4, 2017 | Mary Coyle | Nova Scotia | vacant | Non-affiliated | Appointed to Senate | ||
| Mary Jane McCallum | Manitoba | ||||||
| January 4, 2018 | Lynn Beyak | Ontario | Conservative | Non-affiliated | Removed from Conservative caucus | ||
| February 2, 2018 | Joan Fraser | Quebec | Senate Liberal | vacant | Resigned from Senate | ||
| Colin Kenny | Ontario | ||||||
| Claudette Tardif | Alberta | ||||||
| February 7, 2018 | Mary Coyle | Nova Scotia | Non-affiliated | ISG | Redesignated from non-affiliated | ||
| Mary Jane McCallum | Manitoba | ||||||
| February 15, 2018 | Robert Black | Ontario | vacant | Non-affiliated | Appointed to Senate | ||
| Marty Deacon | |||||||
| February 28, 2018 | Robert Black | Ontario | Non-affiliated | ISG | Redesignated from non-affiliated | ||
| Marty Deacon | |||||||
| March 15, 2018 | Yvonne Boyer | Ontario | vacant | Non-affiliated | Appointed to Senate | ||
| March 16, 2018 | Charlie Watt | Quebec | Senate Liberal | vacant | Resigned from Senate | ||
| March 28, 2018 | Yvonne Boyer | Ontario | Non-affiliated | ISG | Redesignated from non-affiliated | ||
| April 24, 2018 | David Adams Richards | New Brunswick | ISG | Non-affiliated | Redesignated from Independent Senators Group | ||
| May 11, 2018 | Nancy Greene Raine | British Columbia | Conservative | vacant | Mandatory retirement | ||
| June 1, 2018 | Mohamed-Iqbal Ravalia | Newfoundland and Labrador | vacant | Non-affiliated | Appointed to Senate | ||
| June 6, 2018 | Pierre Dalphond | Quebec | vacant | Non-affiliated | Appointed to Senate | ||
| Donna Dasko | Ontario | ||||||
| June 7, 2018 | Mohamed-Iqbal Ravalia | Newfoundland and Labrador | Non-affiliated | ISG | Redesignated from non-affiliated | ||
| June 8, 2018 | Pierre Dalphond | Quebec | |||||
| Donna Dasko | Ontario | ||||||
| David Adams Richards | New Brunswick | ||||||
| June 15, 2018 | Colin Deacon | Nova Scotia | vacant | Non-affiliated | Appointed to Senate | ||
| June 20, 2018 | Julie Miville-Dechêne | Quebec | |||||
| August 12, 2018 | Anne Cools | Ontario | ISG | vacant | Mandatory retirement | ||
| August 21, 2018 | Betty Unger | Alberta | Conservative | ||||
| September 19, 2018 | Julie Miville-Dechêne | Quebec | Non-affiliated | ISG | Redesignated from non-affiliated | ||
| September 21, 2018 | Colin Deacon | Nova Scotia | |||||
| September 24, 2018 | Bev Busson | British Columbia | vacant | Non-affiliated | Appointed to Senate | ||
| Marty Klyne | Saskatchewan | ||||||
| September 29, 2018 | Art Eggleton | Ontario | Senate Liberal | vacant | Mandatory retirement | ||
| October 3, 2018 | Peter Boehm | Ontario | vacant | Non-affiliated | Appointed to Senate | ||
| Patti LaBoucane-Benson | Alberta | ||||||
| Paula Simons | |||||||
| October 11, 2018 | Josée Forest-Niesing | Ontario | |||||
| Brian Francis | Prince Edward Island | ||||||
| October 17, 2018 | Bev Busson | British Columbia | Non-affiliated | ISG | Redesignated from non-affiliated | ||
| Josée Forest-Niesing | Ontario | ||||||
| Brian Francis | Prince Edward Island | ||||||
| October 18, 2018 | Peter Boehm | Ontario | |||||
| Paula Simons | Alberta | ||||||
| October 30, 2018 | Patti LaBoucane-Benson | Alberta | |||||
| October 31, 2018 | Marty Klyne | Saskatchewan | |||||
| December 12, 2018 | Margaret Dawn Anderson | Northwest Territories | vacant | Non-affiliated | Appointed to Senate | ||
| Pat Duncan | Yukon | ||||||
| Stan Kutcher | Nova Scotia | ||||||
| Rosemary Moodie | Ontario | ||||||
| December 19, 2018 | Mobina Jaffer | British Columbia | Senate Liberal | Non-affiliated | Resigned from Senate Liberal caucus | ||
| February 21, 2019 | Margaret Dawn Anderson | Northwest Territories | Non-affiliated | ISG | Redesignated from non-affiliated | ||
| Pat Duncan | Yukon | ||||||
| Stan Kutcher | Nova Scotia | ||||||
| Rosemary Moodie | Ontario | ||||||
| April 22, 2019 | Ghislain Maltais | Quebec | Conservative | vacant | Mandatory retirement | ||
| June 12, 2019 | Mobina Jaffer | British Columbia | Non-affiliated | ISG | Redesignated from non-affiliated | ||
| July 23, 2019 | Tony Loffreda | Quebec | vacant | Non-affiliated | Appointed to Senate | ||
| August 14, 2019 | Raynell Andreychuk | Saskatchewan | Conservative | vacant | Mandatory retirement | ||
| August 25, 2019 | Jacques Demers | Quebec | ISG | vacant | Mandatory retirement | ||
This is a table of senate membership changes in the 42nd Canadian Parliament since election day.