Prince Peter Khristianovich Wittgenstein (1769-1843) was a Russian Field Marshal distinguished for his services in the Napoleonic wars.

Born count Ludwig Adolf Friedrich of Sayn-Wittgenstein-Ludwigsburg, he was descended from a family of formerly independent counts in Westphalia. His father had settled in Russia, and he entered the army, distinguishing himself in the Polish War of 1794-95, and then serving in the Caucasus. In 1808, he fought at Austerlitz, in 1806 against the Turks and in 1807 against Napoleon at Friedland and against the Swedes in Finland.

In the war of 1812 he commanded the right wing army of the Russians. In the campaign of 1813 in January he took over the command of the Russian army after Kutuzov's death. But after the defeats of the Spring campaign he laid down this command and led an army corps during the Dresden and Leipzig campaigns, and at Bar-sur-Aube in the 1814 campaign he was severely wounded. In 1823 he was promoted Field Marshal, and in 1828 he was appointed to command the Russian army in the war against Turkey. But ill health soon obliged him to retire. In 1834 the king of Prussia gave him the title of prince. He died on the 11th of June 1843 in Lemberg, where he looked after estates of his wife, a wealthy Radziwill heiress.