John Baker, English-Australian politician, 2nd Premier of South Australia (born 1813)

John Baker was an early South Australian pastoralist and politician. He was the second Premier of the colony of South Australia, succeeding Boyle Travers Finniss; however, he only held office for 12 days from 21 August to 1 September 1857 before being succeeded by the third Premier of the colony, Robert Torrens.

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.