John Clarkson Maddison was a New South Wales politician, Attorney General, Minister for Justice and Deputy Leader for the Liberal Party of New South Wales in the cabinets of Robert Askin, Tom Lewis and Sir Eric Willis until the Liberal party lost the 1976 election. Maddison was first elected to the New South Wales Legislative Assembly for the Electoral district of Hornsby in 1962 until 1973 and thereon as member for Ku-ring-gai until his retirement in 1980.

The New South Wales Liberal Party, officially called the Liberal Party of Australia, New South Wales Division, and colloquially known as the NSW Liberal Party, is the state division of the Liberal Party of Australia in New South Wales. The party is currently in Opposition in New South Wales in a coalition with the National Party. The party is part of the federal Liberal Party which is in opposition on the mainland of Australia, with Tasmania being the exception.