Barry Mather (20 February 1909 – 30 March 1982) was a Canadian journalist, columnist, and politician.

Born in Condor, Alberta, he was a journalist for the Vancouver News Herald and a columnist with The Vancouver Sun before being elected to the House of Commons of Canada in the 1962 federal election for the British Columbia riding of New Westminster. A member of the New Democratic Party, he was re-elected in the 1963, 1965, 1968, and 1972 elections in the ridings of New Westminster, Surrey, and Surrey—White Rock.

In 1965, he was the first Member of Parliament to introduce a freedom of information bill as a private member's bill. Although it didn't pass, he would re-introduce the same legislation in every parliamentary session between 1968 and 1974. In 1983, an Access to Information Act would finally be passed.^[1] Mather was also one of the first parliamentarians to call for restrictions on the sale of cigarettes; in 1969, he called for a ban on all cigarette advertising.^[2]

He was the co-author of the 1958 book, New Westminster, The Royal City. He was married to Camille Mather, a former Co-operative Commonwealth Federation member of the Legislative Assembly of British Columbia in the riding of Delta. They had two daughters: Mary and Jane.

He died of a heart attack during a vacation in Nerja in 1982.