John Warren (3 September 1830 – 13 September 1914) was an Australian pastoralist and politician. He was a member of the South Australian Legislative Council from 1888 to 1912, representing North-Eastern District.
Warren was born the son of John Warren Snr at Coxton Farm, near Elgin, Morayshire, Scotland. His father emigrated to South Australia in 1838, perhaps on the same boat as his friend Thomas Hogarth. The son followed four years later and joined his parents at Mount Crawford. Warren joined Hogarth in developing a pastoral lease at Strangways Springs until the death of Hogarth, then around 1882 another lease near the Australian Overland Telegraph Line with Hogarth's sons.
In 1852 he went to the Victorian gold fields for a brief period. On his return to South Australia he became Chairman of Mt Crawford District Council.
Warren married Margaret Hogarth on 11 December 1963, six months after the death of his mother, Lydia Campbell Warren (ca.1785 – 1 June 1863). They had 12 children, including:
Warren's sister Jane married William Bakewell on 20 April 1844.
Warren was an enthusiastic member of the voluntary militia, which he joined in 1861. He was presented with the Imperial long service medal and was captain of the Williamstown Company until it was disbanded, when he was appointed acting captain attached to the Gawler Mounted Infantry. He was an expert marksman and almost never missed a parade, but was never promoted. Warren was also a prominent member of the Church of England.
Warren took an active interest in the development of the Northern Territory, and as early as 1862 was largely interested in a sheep station on the route of the transcontinental telegraph line, which station he carried on in partnership with his brothers-in-law (the Messrs. Hogarth).