John Parmenter Robarts PC CC QC (January 11, 1917 – October 18, 1982) was a Canadian lawyer and politician who served as the 17th premier of Ontario from 1961 to 1971. He was a member of the Progressive Conservative Party of Ontario.

Robarts was born in Banff, Alberta, to Herbert Roberts and Ellen Florence May Robarts, making him the only Ontario premier not to have been born in Ontario. As a young man, he moved to London, Ontario, with his family, where he studied at Central Collegiate (today, London Central Secondary School) and at the University of Western Ontario (UWO) in business administration. While attending UWO, he joined the Delta Upsilon fraternity. He played for Western Mustangs football, coached by John P. Metras.

Robarts enrolled to study law at Osgoode Hall Law School, but his education was interrupted by service with the Royal Canadian Navy during World War II. He served as an officer on HMCS Uganda. After the war, he returned to law school and graduated in 1948.

Robarts practiced law in London, Ontario, and was elected to city council in 1948. In 1951, he was elected as a member of provincial parliament (MPP) to the Legislative Assembly of Ontario, as a Progressive Conservative (PC) from the city. In that era, MPPs not in cabinet were essentially working part-time due to relatively light legislative duties. Robarts commuted by train from the Queen's Park legislature in Toronto, the provincial capital, to his family and law practice in London, effectively combining his legislative work with his legal career. His wife Norah disliked Toronto and remained at home in London for most of their marriage. The couple raised two children.

He entered the cabinet of Leslie Frost in 1958 as minister without portfolio, and was promoted to minister of education in 1959. The province was in the midst of a major building phase with its education system, to accommodate an enormous increase in enrollment following the Baby Boomer generation of the post-World War II era, and Robarts played an important role as education minister, with the establishment of new institutions such as York University.

In 1961, Robarts became the 17th premier of Ontario, and served in that capacity until 1971. He was an advocate of individual freedoms, and promoted the rights of the provinces against the centralizing initiatives of the federal government. He also promoted national unity against Quebec separatism, and hosted the 1967 "Confederation of Tomorrow" conference in Toronto. Although unsuccessful attempt to achieve an agreement for a new Constitution of Canada, Robarts has been praised for facilitating interprovincial dialogue with Quebec.

He initially opposed Canadian Medicare when it was proposed, but later endorsed it fully following New Democratic Party (NDP) candidate Kenneth Bolton's upset by-election victory on the issue in the London-area riding of Middlesex South.

As a civil libertarian, and a strong believer in the promotion of both official languages, Robarts opened the door to French language education in Ontario schools. In 1972 he was made a Companion of the Order of Canada.