The Tosna (Russian: То́сна) 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. Its length is 121 kilometres. Its drainage basin covers 1,640 square kilometres which mainly has northward flowing streams. Its main tributary is the Yeglinka which is on the left bank.
