The Saskatchewan Progress Party (SPP) is a liberal political party in the Canadian province of Saskatchewan. It was founded in 1905 as the Liberal Party of Saskatchewan, and retained that name until members voted to change it in 2023. Until 2009, the party was affiliated with the Liberal Party of Canada.

Thomas Clement Douglas was a Scottish Canadian politician who served as the seventh premier of Saskatchewan from 1944 to 1961 and Leader of the New Democratic Party from 1961 to 1971. A Baptist minister, he was elected to the House of Commons of Canada in 1935 as a member of the Co-operative Commonwealth Federation (CCF). He left federal politics to become Leader of the Saskatchewan Co-operative Commonwealth Federation and then the seventh Premier of Saskatchewan. His government introduced the continent's first single-payer, universal health care program.