The 1875 Ontario general election was the third general election held in the province of Ontario, Canada. It was held on January 18, 1875, to elect the 88 Members of the 3rd Legislative Assembly of Ontario ("MLAs").
The Ontario Liberal Party, led by Oliver Mowat, increased its majority in the Legislature for its second term in government.
The Ontario Conservative Party, led by Matthew Crooks Cameron lost four of its seats.
The Legislative Assembly had passed several pieces of legislation that impacted on the current election:
The Assembly was increased from 82 to 88 members, through the following changes:
|- ! colspan=2 rowspan=2 | Political party ! rowspan=2 | Party leader ! colspan=4 | MLAs ! colspan=4 | Votes |- ! Candidates !1871 !1875 !ñ !# ! ñ !% ! ñ (pp)
|style="text-align:left;"|Oliver Mowat | 84 || 43 || 49 || 6 || 90,809 || 22,443 || 47.55% || 4.75
|rowspan="2" style="text-align:left;"|Matthew Crooks Cameron | 81 || 38 || 35 || 3 || 87,802 || 27,876 || 45.98% || 0.13
| 1 || – || 1 || 1 || 1,553 || 1,553 || 0.81% || New
| || 2 || – || 2 || 2 || 2,129 || 2,129 || 1.11% || New
| || 1 || – || 1 || 1 || 1,125 || 1,125 || 0.59% || New
| || 1 || 1 || – || 1 || 791 || 325 || 0.41% || 0.44
| || 11 || – || – || – || 6,757 || 5,454 || 3.54% || 2.54 |- ! colspan="3" style="text-align:left;" | Total |181||82 ! " colspan="2"|88 ! " colspan="2"|190,966 ! " colspan="2"| 100.00% |- | colspan="7" style="text-align:left;" | Voter turnout | 190,966 | 60,255 | 67.28 | 4.35 |- | colspan="7" style="text-align:left;" | Registered electors | 283,856 | 76,139 | colspan="2"| |- | style="text-align:left;" rowspan="2" colspan="3" |Acclamations | style="text-align:left;" colspan="2" | ||8 |- | style="text-align:left;" colspan="2" | ||1
Party designations are as follows:
Northern Ontario
Ottawa Valley
Saint Lawrence Valley
Central Ontario
Georgian Bay
Wentworth/Halton/Niagara
Midwestern Ontario
Southwestern Ontario
Peel/York/Ontario
The following constituencies had elections which were declared void, for which writs of election were issued and elections held prior to the opening of the first session of the new Legislature: