Pyotr Ivanovich Lyapin (Russian: Пётр Иванович Ляпин; 25 June 1894 – 12 January 1954) was a Soviet military leader, Lieutenant General (2 November 1944).

[1] Pyotr Ivanovich Lyapin was born on 25 June 1894, in the village of Romodanovo, Penza Governorate (now in the Romodanovsky District, Mordovia) into a peasant family.

In January 1916, he was drafted into the ranks of the Russian Imperial Army, after which he was sent as a private to the 101st Reserve Infantry Regiment in Saransk.

With the beginning of the war, Lyapin was in his previous position and in June 1941, he was surrounded, but led a group of fighters and commanders of the 10th Army, which was fighting against superior German forces, and then withdrew from the encirclement.

In April of the same year, on the instructions of the Military Council of the Western Front, he worked on inspecting the defenses of the 11th Guards, 10th and 49th Armies.

Since October 1949, he was at the disposal of the Minister of Defense and in December of the same year, he was appointed to the post of Assistant Commander of the Don Military District.