The 1883 Ontario general election was the fifth general election held in the province of Ontario, Canada, to elect the 88 Members of the 5th Legislative Assembly of Ontario ("MLAs"). Held on February 27, 1883, the fifth Ontario provincial election was until 2025 the only one ever contested in the month of February.
The Ontario Liberal Party, led by Oliver Mowat, won a fourth consecutive term in government, despite losing nine seats in the Legislature.
The Ontario Conservative Party, led by William Ralph Meredith, won eight additional seats.
|- ! colspan=2 rowspan=2 | Political party ! rowspan=2 | Party leader ! colspan=4 | MNAs ! colspan=4 | Votes |- ! Candidates !1879 !1883 !ñ !# ! ñ !% ! ñ (pp)
|style="text-align:left;"|Oliver Mowat | 87 || 57 || 48 || 9 || 125,017 || 5,869 || 48.20% || 0.13
|style="text-align:left;"|William Ralph Meredith | 80 || 29 || 37 || 8 || 120,853 || 2,340 || 46.59% || 1.23
| || 3 || – || 2 || 2 || 3,239 || 3,239 || 1.25% ||New
| || 8 || – || 1 || 1 || 3,956 || 3,071 || 1.53% || 1.73
| || 4 || 2 || – || 2 || 2,354 || 243 || 0.91% || 0.06
| || 3 || – || – || – || 3,957 || 3,957 || 1.53% ||New |- ! colspan="3" style="text-align:left;" | Total |185||88 ! " colspan="2"|88 ! " colspan="2"|259,376 ! " colspan="2"| 100.00% |- | colspan="7" style="text-align:left;" | Rejected ballots | 1,722 | 1,722 | colspan="2"| |- | colspan="7" style="text-align:left;" | Voter turnout | 261,098 | 13,241 | 67.95 | 4.73 |- | colspan="7" style="text-align:left;" | Registered electors | 384,255 | 7,830 | colspan="2"| |- | style="text-align:left;" rowspan="2" colspan="3" |Acclamations | style="text-align:left;" colspan="2" | ||4 |- | 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