Tosna River is a river in Luzhsky, Tosnensky, and Kirovsky Districts of Leningrad Oblast, Russia, as well as in the city of Saint Petersburg. It is a left tributary of Neva River. The towns of Tosno, Nikolskoye, and Otradnoye, as well as the urban-type settlement of Ulyanovka are located along the Tosna. The length of the Tosna is , and the area of its drainage basin is . The main tributary of the river is the Yeglinka (left).