The Tosna () is a northward 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 the Neva. The towns of Tosno, Nikolskoye, and Otradnoye, as well as the urban-type settlement of Ulyanovka are along it.
The Tosna River is a tributary of the Neva River, flowing through several districts in Leningrad Oblast, Russia, including Saint Petersburg.