Allan Joseph MacEachen was a Canadian politician and statesman who served as a senator and several times as a Cabinet minister. He was the first deputy prime minister of Canada and served from 1977 to 1979 and 1980 to 1984.

The deputy prime minister of Canada is a minister of the Crown and a member of the Canadian Cabinet. The office is conferred at the discretion of the prime minister and does not have an associated departmental portfolio. Canadian deputy prime ministers are appointed to the Privy Council and styled as the Honourable, a privilege maintained for life.