John Wayne Olsen, AO is an Australian former politician, diplomat and football commissioner. He was Premier of South Australia between 28 November 1996 and 22 October 2001. He is now President of the Federal Liberal Party, Chairman of the Australian American Association, Chairman of the Adelaide Football Club and Deputy Chairman of the Adelaide Oval Stadium Management Authority.

The premier of South Australia is the head of government in the state of South Australia, Australia. The Government of South Australia follows the Westminster system, with a Parliament of South Australia acting as the legislature. The premier is appointed by the governor of South Australia, and by modern convention holds office by virtue of their ability to command the support of a majority of members of the lower house of Parliament, the House of Assembly.