Pierre Louis-Dreyfus was born on 17 May 1908 in Paris, one of four children born to Charles Louis-Dreyfus (1870–1929),Funding Universe: "Groupe Louis Dreyfus S.A. History" retrieved 12 August 2013 a merchant and ship-owner, and Sarah Germaine Hément. His family was Jewish. His paternal grandfather, Léopold Louis-Dreyfus, founded the Louis Dreyfus Group in 1851. He had two siblings, brother François Louis Dreyfus (1909–1958) and sister, Arlette Louis Dreyfus (1911–2001). His granddaughter is Julia Louis-Dreyfus.
