Léon Balcer, PC (October 13, 1917 – March 22, 1991) was a Canadian politician.

He was one of only three Progressive Conservative (or PC) candidates who were elected to the House of Commons in 1949 from Quebec, representing the district of Trois-Rivières.

Balcer held numerous ministerial positions in the cabinet of Prime Minister John Diefenbaker, including Solicitor General of Canada (1957–1960), and Minister of Transport (1960–1963).

"[3] In 1964, he had led a small group of PC MPs who broke with Diefenbaker and supported a new flag of Canada during the flag debate championed by the Liberal prime minister, Lester B. Pearson.

Balcer ran as a Liberal candidate in the district of Trois-Rivières in 1966, but lost to Union Nationale incumbent Yves Gabias.