4th Saskatchewan Legislature
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. The Liberal Party|Liberal Party] led by William Melville Martin formed the government. The Conservative Party of Saskatchewan led by Donald Maclean formed the official opposition. Wellington Willoughby had resigned from the assembly shortly after the election.
Robert Menzies Mitchell served as speaker for the assembly until May 1919. George Adam Scott succeeded Mitchell as speaker.
Members of the Assembly
The following members were elected to the assembly in 1917:Notes:
Party Standings
Notes:By-elections
By-elections were held to replace members for various reasons:| 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 |
| Moose Jaw City | William Erskine Knowles | Liberal | June 10, 1918 | Knowles ran for reelection after being named to cabinet |
| Saltcoats | George William Sahlmark | Liberal | July 11, 1918 | James Alexander Calder ran for House of Commons seat |
| Estevan | Robert Dunbar | Liberal | October 24, 1918 | George Alexander Bell resigned seat |
| Weyburn | Charles McGill Hamilton | Liberal | July 22, 1919 | R M Mitchell named superintendent for provincial mental hospital |
| Pelly | Sarah Katherine Ramsland | Liberal | July 29, 1919 | Max Ramsland, her husband, died November 1918 |
| Kindersley | Wesley Harper Harvey | Independent Farmer | November 15, 1919 | William Richard Motherwell resigned to protest provincial Liberals support for conscription |
| Weyburn | Charles McGill Hamilton | Liberal | June 15, 1920 | Hamilton ran for reelection after being named to cabinet |
Notes: