Svirstroy is an urban locality (an urban-type settlement) in Lodeynopolsky District of Leningrad Oblast, Russia, located on the left bank of the Svir River several kilometers northeast of the town of Lodeynoye Pole. Municipally, it is incorporated as Svirstroyskoye Urban Settlement, one of the two urban settlements in the district. The name of the settlement is an abbreviation meaning Construction on the Svir. Population:

In 1927, a large-scale construction of the Lower Svir Hydroelectric Station started, and subsequently in 1931, the concentration camp of Svirlag was established. The settlement which hosted the headquarters of Svirlag became known as Svirstroy. In the same year, Svirstroy was granted urban-type settlement status. On May 13, 1963, during the abortive Khrushhyov administrative reform, Svirstroy was subordinated to the town of Podporozhye, but on January 13, 1965 it was transferred back to Lodeynopolsky District.