Tosnensky District (Russian: То́сненский райо́н) is an administrative and municipal district (raion), one of the seventeen in Leningrad Oblast, Russia. It is located in the central southwestern part of the oblast and borders with Kirovsky District in the north, Kirishsky District in the east, Chudovsky District of Novgorod Oblast in the southeast, Novgorodsky District of Novgorod Oblast in the south, Luzhsky District in the southwest, Gatchinsky District in the west, and Pushkinsky and Kolpinsky Districts of the federal city of Saint Petersburg in the northwest. The area of the district is 3,585.4 square kilometers (1,384.3 sq mi). Its administrative center is the town of Tosno. Population (excluding the administrative center): 83,898 (2010 Census); 77,194 (2002 Census); 78,500 (1989 Censu