The 1959 Ontario general election was held on June 11, 1959, to elect the 98 members of the 26th Legislative Assembly of Ontario (Members of Provincial Parliament, or "MPPs") of the Province of Ontario.
The Ontario Progressive Conservative Party, led by Leslie Frost, won a sixth consecutive term in office, and maintained its majority in the legislature, although it lost 12 of the 83 seats it had won in the previous election.
The Ontario Liberal Party, led by John Wintermeyer, increased its caucus from 11 to 22 members, and continued in the role of official opposition. Liberal-Labour MPP Albert Wren was re-elected and continued to sit with the Liberal caucus. Wren died in 1961 and was succeeded in a by-election by Robert Gibson.
The social democratic Co-operative Commonwealth Federation (CCF), led by Donald C. MacDonald, won two additional seats, for a total of five.
Results.
Synopsis of results.
 ;templatestyles src="Reflist/styles.css" / ;
 ;templatestyles src="Legend/styles.css" / ;  = open seat
 ;templatestyles src="Legend/styles.css" / ;  = turnout is above provincial average
 ;templatestyles src="Legend/styles.css" / ;  = incumbency arose from byelection gain
 ;templatestyles src="Legend/styles.css" / ;  = other incumbents renominated
 ;templatestyles src="Legend/styles.css" / ;  = Liberal-Labour candidate
 ;templatestyles src="Legend/styles.css" / ;  = Labour-CCF candidate
Seats that changed hands.
There were 14 seats that changed allegiance in the election.
 ;templatestyles src="Col-begin/styles.css"/ ;
References.
 ;templatestyles src="Reflist/styles.css" / ;