George Conrad Hannan (10 September 1910 – 1 May 2009) was an Australian politician who served as a Senator for Victoria from 1956 to 1965 and 1970 to 1974. He was a member of the Liberal Party for all but the last few months of his career, and was known as a strident anti-communist. He lost Liberal preselection in 1973, and the following year announced the formation of a new social conservative political party, the National Liberal Party. He was unsuccessfully in his bid for re-election at the 1974 election and dissolved the party shortly after.