John Jenkins, American-Australian businessman and politician, 22nd Premier of South Australia (died 1923)

John Greeley Jenkins was an American-Australian politician. He was Premier of South Australia from 1901 to 1905. He had previously served as Minister for Education and the Northern Territory and Commissioner for Public Works under Thomas Playford II, Commissioner of Public Works under Charles Kingston and Chief Secretary under Frederick Holder. He was subsequently Agent-General for South Australia from 1905 to 1908. He also played a major role in an agreement between the States about the River Murray, and in continuing attempts to develop the Northern Territory.