Count Pyotr (Petr) Ivanovich Panin (; 1721 – April 26, 1789) was a Russian soldier who later served as a general-in-chief in the Imperial Russian Army.
He was younger brother of Nikita Ivanovich Panin and the grand uncle of Alexander Kurakin. He was also the father of Nikita Petrovich Panin.
He fought with distinction in the Seven Years' War and in the Russo-Turkish War of 1768–1774. He was also involved in capturing Bender on September 27, 1770. In 1773–1775, he participated in suppressing Pugachev's Rebellion.
He died in Moscow, as a senior general of the Russian Army.
On August 29, 2010, in memory of the liberation of Bender from Turkish rule, a monument to Count Petr Ivanovich Panin was unveiled at the Main Gate of the Tighina (Bender, Bendery) Fortress.