Lance Herbert Barnard AO (1 May 1919 – 6 August 1997) was an Australian politician and diplomat.
He was a member of the House of Representatives from 1954 to 1975, representing the Labor Party, and served as the party's deputy leader from 1967 to 1974.
In the Whitlam Government, he was deputy prime minister from 1972 to 1974.
After leaving politics he served as Ambassador to Norway, Finland, and Sweden from 1975 to 1978.