| Rona Ambrose | Interim Leader of the Conservative Party of Canada and Leader of the Official Opposition (2015–2017), MP for Sturgeon River—Parkland (2015–2017) and Edmonton—Spruce Grove, Alberta (2004–2015), Minister of Health (2013–2015), Minister of Public Works and Government Services (2010–2013), Minister of Labour (2008–2010), Minister of Intergovernmental Affairs (2007–2008), Minister of the Environment (2006–2007) | |
| Maxime Bernier | Leader of the People's Party (2018–present), Shadow Minister of Innovation, Science and Economic Development (2015–2016, 2017–2018), Minister of State for Small Business, Tourism and Agriculture (2011–2015), Minister of Foreign Affairs (2007–2008), and Minister of Industry (2006–2007), MP for Beauce, Quebec (2006–2019), runner-up in the 2017 leadership election. | |
| Michael Chong | Shadow Minister of Foreign Affairs (2020–present), Shadow Minister of Science (2018–2019), Shadow Minister of Infrastructure and Communities (2017–2018), Shadow Minister of Urban Affairs (2017–2018), Deputy Shadow Minister of the Environment (2015–2016), Minister of Intergovernmental Affairs (2006), Minister of State (Sport) (2006), MP for Wellington—Halton Hills, Ontario (2004–present), 2017 leadership candidate. | |
| Doug Ford | Premier of Ontario (2018–present), Leader of the Progressive Conservative Party of Ontario (2018–present), MPP for Etobicoke North (2018–present), member of the Toronto City Council (2010–2014) | |
| Marilyn Gladu | Shadow President of the Queen's Privy Council for Canada (2020–2021), Shadow Minister of Health (2017–2020), MP for Sarnia—Lambton (2015–present), 2020 permanent and 2022 interim leadership candidate. Endorsed Poilievre. | |
| Garnett Genuis | Shadow Minister of International Development (2020–present), Shadow Minister of Multiculturalism (2019–2020), MP for Sherwood Park—Fort Saskatchewan (2015–present) | |
| Vincenzo Guzzo | Entrepreneur, philanthropist, and television personality. Endorsed Charest. | |
| Stephen Harper | Prime Minister of Canada (2006–2015), Leader of the Conservative Party of Canada (2004–2015), Leader of the Canadian Alliance (2002–2003), MP for Calgary Southwest/Calgary Heritage (2002–2016), MP for Calgary West (1993–1997). Endorsed Poilievre. | |
| Jason Kenney | Premier of Alberta (2019–2022), Leader of the United Conservative Party (2017–2022), Leader of the Progressive Conservative Association of Alberta (2017), and Alberta MLA for Calgary-Lougheed (2017–present), Minister of National Defence (2015), Minister of Employment and Social Development (2013–2015), Minister of Citizenship, Immigration and Multiculturalism (2008–2013), MP for Calgary Midnapore, Alberta (2015–2016) and Calgary Southeast, Alberta (1997–2015) | |
| Tasha Kheiriddin | Political columnist for Postmedia, and author. Endorsed Charest. | |
| Peter MacKay | Deputy Leader of the Conservative Party of Canada (2004–2015), Leader of the Progressive Conservative Party of Canada (2003), Minister of Justice and Attorney General (2013–2015), Minister of National Defence (2007–2013), Minister of Foreign Affairs (2006–2007), MP for Central Nova (1997–2015) and runner-up in the 2020 leadership election | |
| Scott Moe | Premier of Saskatchewan (2018–present), Leader of the Saskatchewan Party (2018–present), Saskatchewan MLA for Rosthern-Shellbrook (2011–present) | |
| Ben Mulroney | Television presenter and son of former prime minister Brian Mulroney | |
| Caroline Mulroney | Minister of Transportation of Ontario (2018–present), Minister of Francophone Affairs (2018–present), Attorney General of Ontario (2018–2019), MPP for York—Simcoe (2018–present) and daughter of former Prime Minister Brian Mulroney | |
| Kevin O'Leary | Businessman, investor, television personality and 2017 Conservative Party of Canada leadership election candidate. Endorsed Charest. | |
| Lisa Raitt | Deputy Leader of the Conservative Party of Canada and Deputy Leader of the Official Opposition (2017–2019), Shadow Minister of Finance (2015–2016), Minister of Transport (2013–2015), Minister of Labour (2010–2013), Minister of Natural Resources (2008–2010), President and CEO of the Toronto Port Authority (2002–2008), MP for Milton, Ontario (2015–2019) and Halton, Ontario (2008–2015), and 2017 leadership candidate. | |
| Michelle Rempel Garner | Shadow Minister for Natural Resources (2021–present), Shadow Minister for Health (2020–2021), Minister of Western Economic Diversification (2013–2015) and MP for Calgary Nose Hill (since 2011). Endorsed Brown. | |
| Andrew Scheer | Shadow Minister of Infrastructure and Communities (2020–present), MP for Regina—Qu'Appelle (2004–present), former leader of the Conservative Party of Canada and Leader of the Official Opposition (2017–2020), Speaker of the House of Commons (2011–2015). Endorsed Poilievre | |
| Brad Wall | Premier of Saskatchewan (2007–2018), Leader of the Saskatchewan Party (2004–2018), Saskatchewan MLA for Swift Current (1999–2018) | |