Louis de Rouvroy, duc de Saint-Simon, French soldier and diplomat (d. 1755) was born on January 16, 1675.

Louis de Rouvroy, duc de Saint-Simon, GE, was a French soldier, diplomat, and memoirist. He was born in Paris at the Hôtel Selvois, 6 rue Taranne. The family's ducal peerage (duché-pairie), granted in 1635 to his father Claude de Rouvroy (1608–1693), served as both perspective and theme in Saint-Simon's life and writings. He was the second and last Duke of Saint-Simon.