John Hart, English-Australian politician, 10th Premier of South Australia (died 1873)

Captain John Hart CMG was a South Australian politician and a Premier of South Australia.

The Premier of South Australia is the head of government in the Australian state of South Australia. The Government of South Australia follows the Westminster system, with the 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.

February 25 is the 56th day of the year in the Gregorian calendar; 309 days remain until the end of the year.