Mary Walker-Sawka was a Canadian film producer, who was the first woman ever to seek the leadership of a major federal political party in Canada. She was a surprise last-minute candidate at the 1967 leadership convention of the Progressive Conservative Party of Canada, a centre-right party that formed the official opposition in the House of Commons of Canada at the time. Unlike other leadership candidates, who had spent months campaigning, announcing policy positions and travelling across the country to meet delegates, Walker-Sawka announced and filed her candidacy just a few days before the convention began.