The 1886 Ontario general election was the sixth general election held in the province of Ontario, Canada. It was held on December 28, 1886, to elect the 90 Members of the 6th Legislative Assembly of Ontario ("MLAs"). The election results were characterized a "crushing defeat for the Conservatives.
The Ontario Liberal Party, led by Oliver Mowat, won a fifth consecutive term in government and an increased majority in the Legislature.
The Ontario Conservative Party, led by William Ralph Meredith lost five of its seats.
In Toronto, this and the next election (1890) were held under the Limited Vote system wherein Toronto voters had two votes for the three MPPs in their district. This allowed a degree of minority representation.
The Assembly was increased from 88 to 90 members, through the following changes:
|- ! colspan=2 rowspan=2 | Political party ! rowspan=2 | Party leader ! colspan=5 | MPPs ! colspan=3 | Votes |- ! Candidates !1883 !<small>Dissol.</small> !1886 !ñ !# !% ! ñ (pp)
|style="text-align:left;"|Oliver Mowat |88 |48 | |57 |9 |153,282 |48.41% |0.21
|style="text-align:left;"|William Ralph Meredith |83 |37 | |32 |5 |148,969 |47.05% |0.46
|style="text-align:left;"| |5 |1 | |1 | |2,145 |0.68% |0.85
|style="text-align:left;"| | |2 | |– |2 |colspan="3"|Did not campaign
|style="text-align:left;"| |5 |– |– |– | |12,196 |3.85% |2.32
|style="text-align:left;"| |1 |– |– |– | |14 |– |
|style="text-align:left;"| | |– |– |– | |colspan="3"|Did not campaign
|colspan="3"| | |colspan="5"| |-style="background:#E9E9E9;" |colspan="3" style="text-align:left;"|Total |182 |88 |88 |90 | |316,606 |100.00% | |- |colspan="8" style="text-align:left;"|Blank and invalid ballots |align="right"|3,622 |style="background:#E9E9E9;" colspan="2"| |-style="background:#E9E9E9;" |colspan="8" style="text-align:left;"|Registered voters / turnout |463,025 |68.85 |0.90
|- ! colspan=2 | Political party ! Candidate ! Votes ! % ! Elected ! Incumbent |-
|style="text-align:left;"|Edward Frederick Clarke |7,032 ||26.28 |style="text-align:center;"| |-
|style="text-align:left;"|Henry Edward Clarke |6,883 ||25.72 |style="text-align:center;"| |style="text-align:center;"| |-
|style="text-align:left;"|John Leys |5,380 ||20.11 |style="text-align:center;"| |-
|style="text-align:left;"|Charles March |4,055 ||15.15 |-
|style="text-align:left;"|John Roney |3,408 ||12.74 |- !colspan="3" style="text-align:right;"|Majority |1,325 ||4.96 |- !colspan="3" style="text-align:right;"|Turnout |14,916 ||44.80 |- !colspan="3" style="text-align:right;"|Registered voters |33,296
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