The 4th Legislative Assembly of Saskatchewan was elected in the Saskatchewan general election held in June 1917. The assembly sat from November 13, 1917, to May 16, 1921. [1] The Liberal Party led by William Melville Martin formed the government. [2] The Conservative Party of Saskatchewan led by Donald Maclean formed the official opposition. Wellington Willoughby had resigned from the assembly shortly after the election. [3]
Robert Menzies Mitchell served as speaker for the assembly until May 1919. George Adam Scott succeeded Mitchell as speaker. [4]
The following members were elected to the assembly in 1917: [5]
Notes:
| Affiliation | Members | |
|---|---|---|
| Liberal | 51 | |
| Conservative Party of Saskatchewan | 7 | |
| Independent | 1 | |
| Active service vote [nb 1] | 3 | |
|  Total | 62 | |
|  Government Majority | 40 | |
Notes:
By-elections were held to replace members for various reasons: [5]
| Electoral district | Member elected | Party | Election date | Reason | 
|---|---|---|---|---|
| Last Mountain | Samuel John Latta | Liberal | November 6, 1917 | Latta ran for reelection after being named to cabinet [6] | 
| Moose Jaw City | William Erskine Knowles | Liberal | June 10, 1918 | Knowles ran for reelection after being named to cabinet [6] | 
| Saltcoats | George William Sahlmark | Liberal | July 11, 1918 | James Alexander Calder ran for House of Commons seat [7] | 
| Estevan | Robert Dunbar | Liberal | October 24, 1918 | George Alexander Bell resigned seat [8] | 
| Weyburn | Charles McGill Hamilton | Liberal | July 22, 1919 | R M Mitchell named superintendent for provincial mental hospital [9] | 
| Pelly | Sarah Katherine Ramsland [nb 1] | Liberal | July 29, 1919 | Max Ramsland, her husband, died November 1918 [10] | 
| Kindersley | Wesley Harper Harvey | Independent Farmer | November 15, 1919 | William Richard Motherwell resigned to protest provincial Liberals support for conscription [11] | 
| Weyburn | Charles McGill Hamilton | Liberal | June 15, 1920 | Hamilton ran for reelection after being named to cabinet [6] | 
Notes: