Henry Richmond Droop

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Henry Richmond Droop (12 September 1832 – 21 March 1884) was an English mathematician. He devised the Droop quota used in the Single Transferable Vote, he also may have been the first to write down what later became known as Duverger's Law, in 1869.

He married Clara Baily (ca. 1841 – 7 September 1921) on 17 August 1872 and was the father of archaeologist John Percival Droop (1882–1963).