Colin Grant Clark (2 November 1905 – 4 September 1989) was a British and Australian economist and statistician who worked in both the United Kingdom and Australia.

After graduation he worked as a research assistant with William Beveridge at the London School of Economics (1928–29) and then with Sir Alexander Carr-Saunders and Allyn Young at the University of Liverpool (1929–30).

During this time he ran unsuccessful campaigns to be elected to parliament for the Labour Party in the constituency of North Dorset (1929), and later at Liverpool Wavertree (1931) and South Norfolk (1935).

In 1930 he was appointed a research assistant to the National Economic Advisory Council newly convened by Prime Minister Ramsay MacDonald.

His first book was sent to the publisher Daniel Macmillan with a recommendation from John Maynard Keynes: "[...] Clark is, I think, a bit of a genius: almost the only economic statistician I have ever met who seems to me quite first-class.

[9] In 1984 he was named by the World Bank as one of the "pioneers of development" [1] along with Sir Arthur Lewis, Gunnar Myrdal, W.W. Rostow and Jan Tinbergen.