Daniel-Henry Kahnweiler nasceu o 25 de junho de 1884 em Mannheim, Alemanha. Foi casado com Lucie Godon. Morreu o 11 de janeiro de 1979 em Paris, França.
He was the father in law of Michel Leiris. His wife Lucie Godon had a daughter out of wedlock Louise nicknamed Zette and she was for a long time considered her younger sister.