Pyotr Aleksandrovich Marshinskiy (; born 17 February 1986) is a former Russian professional footballer.
He made his debut for FC Moscow on 11 August 2005 in a Russian Cup game against FC Dynamo Makhachkala. He made his next appearance on 2 July 2006 in the next season's Russian Cup game against FC Terek Grozny, FC Moscow eventually reached the final.
His brother Aleksei Marshinskiy is also a professional footballer.