Lionel Massey (July 2, 1916 – July 28, 1965) was a Canadian civil servant and dignitary, most noted for serving as Secretary to the Governor General of Canada during his father Vincent Massey's term as Governor General. Born in Toronto to Vincent and Alice Massey, he was educated at Upper Canada College and Balliol College, Oxford. He served in the King's Royal Rifle Corps during World War II, during which he was injured in Greece and spent time as a German prisoner of war. His brother Hart also served in WWII, as a Spitfire pilot. He died in Toronto on July 28, 1965 after suffering a stroke.