Charles Thomas Clough MA, LLD, FGS, FRSE (23 December 1852 – 27 August 1916) was a prominent British geologist and mapmaker. The Edinburgh Geological Society named the Clough Medal in his honour.
Charles Clough was born in Huddersfield, the fifth of six children to the lawyer Thomas William Clough and Amelia Jane Ibeson. He attended Rugby School from 1867 to 1871, and in 1871 was accepted at St John's College, Cambridge, to study Natural Sciences. He graduated in 1878 but was working from 1875, being employed as an Assistant Geologist on the national Geological Survey.
He initially worked in the Teesdale and Cheviot districts of Northern England, under H.H. Howell. In 1884 he was transferred to the Edinburgh office, in Scotland. Here his fame within his field grew for his work in the North West Highlands and the Hebrides. In 1896 he was promoted to full Geologist and, on the death of William Gunn, in 1902 to District Geologist.
In 1906 the Geological Society of London awarded him the Murchison Medal. In 1908 he was elected President of the Edinburgh Geological Society, a post he held until 1910.
In the summer of 1916 St Andrews University awarded him an Honorary degree as a Doctor of Laws (LLD). In the same year he was elected Fellow of the Royal Society of Edinburgh, his proposers were John Horne, Benjamin Neeve Peach, Robert Kidston and Sir John Smith Flett.