The 19th Legislative Assembly of Ontario was in session from June 19, 1934, until August 25, 1937, just prior to the 1937 general election. The Ontario Liberal Party led by Mitchell Hepburn came to power with a majority government.
Norman Otto Hipel served as speaker for the assembly.[1]
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| Party | 1934 | Gain/(loss) due to | 1937 | ||||
|---|---|---|---|---|---|---|---|
| Death in office |
Resignation as MPP |
Byelection gain |
Byelection hold | ||||
| Liberal | 65 | (2) | 1 | 2 | 66 | ||
| Conservative | 17 | (1) | 1 | 17 | |||
| Liberal–Progressive | 4 | (1) | 1 | 4 | |||
| United Farmers | 1 | 1 | |||||
| Co-operative Commonwealth | 1 | 1 | |||||
| Labour | 1 | (1) | – | ||||
| Independent | 1 | 1 | |||||
| Vacant | – | – | |||||
| Total | 90 | (3) | (2) | 1 | 4 | 90 | |
| Seat | Before | Change | |||||
|---|---|---|---|---|---|---|---|
| Date | Member | Party | Reason | Date | Member | Party | |
| Wellington South | July 1, 1934 | Duncan Paul Munro | █ Liberal | Died shortly after Election Day | August 20, 1934 | James Harold King | █ Liberal |
| Kenora | July 12, 1934 | Earl Hutchinson | █ Labour | Resigned to enable Heenan to return to Cabinet | August 7, 1934 | Peter Heenan[a 1] | █ Liberal |
| Grey North | July 17, 1934 | David James Taylor | █ Lib-Progressive | Appointed Deputy Minister | August 20, 1934 | Roland Patterson | █ Lib-Progressive |
| Nipissing | January 17, 1935 | Théodore Legault | █ Liberal | Died in office | March 4, 1935 | Joseph Marceau | █ Liberal |
| Hastings East | October 15, 1936 | James Ferguson Hill | █ Conservative | Died in office | December 9, 1936 | Harold Edward Welsh | █ Conservative |