Robert Muir (10 November 1919 – 31 August 2011) was a Canadian Member of Parliament, first in the House of Commons and later in the Senate. Muir sat in both chambers as a member of the Progressive Conservative Party of Canada. He was born in Scotland and raised on Cape Breton Island, Nova Scotia. Before he became a politician, he was also a miner, a union official, a salesman and a businessman during his career. He died at his home in the Cape Breton Regional Municipality in 2011.