Marjorie Jackson-Nelson is an Australian former athlete and politician. She was the Governor of South Australia between 2001 and 2007. She finished her sporting career with two Olympic and seven Commonwealth Games Gold Medals, six individual world records and every Australian state and national title she contested from 1950 to 1954.

The governor of South Australia is the representative in South Australia of the monarch, currently King Charles III. The governor performs the same constitutional and ceremonial functions at the state level as does the governor-general of Australia at the national level. In accordance with the conventions of the Westminster system of parliamentary government, the governor nearly always acts solely on the advice of the head of the elected government, the premier of South Australia. Nevertheless, the governor retains the reserve powers of the Crown, and has the right to dismiss the premier. As from June 2014, Queen Elizabeth II, upon the recommendation of the premier, accorded all current, future and living former governors the title 'The Honourable' for life. The first six governors oversaw the colony from proclamation in 1836, until self-government and an elected Parliament of South Australia was granted in the year prior to the inaugural 1857 election.