Claude Henri de Rouvroy, Comte de Saint-Simon (17 October 1760 – 19 May 1825), better known as Henri de Saint-Simon, was a French political, economic and socialist theorist and businessman whose thought had a substantial influence on politics, economics, sociology and the philosophy of science.

Louis de Rouvroy, duc de Saint-Simon, GE (16 January 16752 March 1755), was a French soldier, diplomat, and memoirist.