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 social democratic Co-operative Commonwealth Federation (CCF), led by Donald C. MacDonald, won two additional seats, for a total of five.