André François-Poncet (13 June 1887, Provins, Seine-et-Marne – 8 January 1978) was a French politician and diplomat whose post as ambassador to Germany allowed him to witness first-hand the rise to power of Adolf Hitler and the Nazi Party, and the Nazi regime's preparations for World War II.
François-Poncet was the son of a counselor of the Court of Appeals in Paris. A student of German studies at the Paris Institute of Political Studies, his first area of study was journalism. One of François-Poncet's early written works included observations made during several journeys to the German Empire in the years prior to World War I. During the war, he served as an infantry lieutenant.
Between 1917 and 1919, he was assigned to the press office of the French embassy in Bern, Switzerland and later served with the International Economic Mission in the United States and in other diplomatic roles under a series of French leaders.
He served as a delegate to the League of Nations, and, in August 1931, was named undersecretary of state and ambassador to Weimar Germany. From his post in Berlin, François-Poncet witnessed the rise of Hitler, and later observed the signs of Germany's plans for World War II. The insightful François-Poncet was described by American journalist William Shirer in his The Rise and Fall of the Third Reich as "the best informed ambassador in Berlin", but the French government generally did not heed the ambassador's many warnings about Hitler's intentions. François-Poncet was inadvertently involved in the purge of the Night of the Long Knives when, in Hitler's justification for the killings, he referred to a dinner François-Poncet had attended with Ernst Röhm and Kurt von Schleicher as evidence that the men had been conspiring with the French to overthrow the German government. As this evidence was manufactured, François-Poncet himself was never named nor charged with anything.