Charles Smith Wilkinson (22 August 1843 – 26 August 1891) was an Australian geologist. He became geological surveyor in charge in New South Wales in 1875 and was president of the Royal Society of New South Wales in 1887.
Wilkinson was born at Pottersbury, Northamptonshire, England, the fourth son of David Wilkinson, C.E., who was associated with George Stephenson in the production of early locomotives. The family moved to Melbourne, Victoria in 1852, and the young Wilkinson was educated at a private school conducted by the Rev. T. P. Fenner.
In December 1859 Wilkinson was given a position in the Geological Survey of Victoria under Alfred Richard Cecil Selwyn. In 1861 he became a field assistant to Richard Daintree with whom he was associated in the survey of part of southern Victoria. In 1863 he was sent to explore the Cape Otway (Victoria) region and in 1866 succeeded Daintree when the latter left for Queensland. In 1868 Wilkinson's health broke down; he resigned from the survey, and spent the next four years at Wagga Wagga, New South Wales. He passed the examination for licensed surveyor in 1872, and was sent by the surveyor-general of New South Wales to the new tin-mining district in New England, New South Wales, on which he reported, and in 1874 he was appointed geological surveyor.
In 1875 Wilkinson was transferred to the mines department with the title of geological surveyor in charge. The systematic geological survey of New South Wales was begun under his direction, and valuable work was done. He urged Joseph Edmund Carne to study geology, subsequently in 1879, Carne joined the survey as assistant to Wilkinson. In 1876 Wilkinson was elected a fellow of the Geological Society of London and in 1881 a fellow of the Linnean Society. In 1882 Edgeworth David was appointed assistant geological surveyor, Wilkinson delegated much responsibility to him.