Pyotr Dmitrievich Grushin (Russian: Пётр Дмитриевич Грушин, January 15, 1906, Volsk, Russian Empire – November 29, 1993) was a Soviet rocket scientist and, from 1966, an academician of the Academy of Sciences of the USSR.
Grushin graduated from Moscow Aviation Institute, where he participated in the development of the MAI Stal plane (Russian: "Сталь", 1931–1934).
[1] His later designed the heavy long-range fighter IDS (Russian: ИДС), later renamed Gr-1 after Grushin.
He was the chief developer of a number of air defence systems at KB Fakel (former OKB-2) located in Khimki.
For the design of the V-750 missile, the interceptor component of the S-75 Dvina air defense system, Grushin was awarded the Hero of Socialist Labour in 1958.