Charles-Maurice de Talleyrand-Périgord (, French: [ʃaʁl mɔʁis də tal(ɛ)ʁɑ̃ peʁiɡɔʁ, - moʁ-]; 2 February 1754 – 17 May 1838), 1st Prince of Benevento, then Prince of Talleyrand, was a French clergyman and leading diplomat. After studying theology, he became Agent-General of the Clergy in 1780. In 1789, just before the French Revolution, he became Bishop of Autun. He worked at the highest levels of successive French governments, most commonly as foreign minister or in some other diplomatic capacity. His career spanned the regimes of Louis XVI, the years of the French Revolution, Napoleon, Louis XVIII, and Louis-Philippe. Those Talleyrand served often distrusted him but, like Napoleon, found him extremely useful. The name "Talleyrand" has become a byword for crafty, cynical diplomacy.

He was Napoleon's chief diplomat during the years when French military victories brought one European state after another under French hegemony. However, most of the time, Talleyrand worked for peace so as to consolidate France's gains. He succeeded in obtaining peace with Austria through the 1801 Treaty of Luneville and with Britain in the 1802 Treaty of Amiens. He could not prevent the renewal of war in 1803 but by 1805 he opposed his emperor's renewed wars against Austria, Prussia, and Russia. He resigned as foreign minister in August 1807, but retained the trust of Napoleon. He conspired to undermine the emperor's plans through secret dealings with Tsar Alexander of Russia and Austrian minister Metternich. Talleyrand sought a negotiated secure peace so as to perpetuate the gains of the French revolution. Napoleon rejected peace and, when he fell in 1814, Talleyrand supported the Bourbon Restoration decided by the Allies. He played a major role at the Congress of Vienna in 1814–1815, where he negotiated a favourable settlement for France and played a role in unwinding the conquests of Napoleon.

Talleyrand polarizes scholarly opinion. Some regard him as one of the most versatile, skilled and influential diplomats in European history, and some believe that he was a traitor, betraying in turn the Ancien Régime, the French Revolution, Napoleon, and the Restoration.