The Svir (Russian: Свирь; Veps: Süvär'; Karelian and Finnish: Syväri) is a river in Podporozhsky, Lodeynopolsky, and Volkhovsky districts in the north-east of Leningrad Oblast, Russia.

The towns of Podporozhye and Lodeynoye Pole, as well as urban-type settlements Voznesenye, Nikolsky, Vazhiny, and Svirstroy are located at the banks of the Svir.

The city of Petrozavodsk and the towns of Suoyarvi, Kondopoga, Medvezhyegorsk, Pudozh, Vytegra, Podporozhye, and Lodeynoye Pole, as well as a number of urban-type settlements, are located within the catchment area of the Svir.

The river flows past the Alexander-Svirsky Monastery, which housed Svirlag (one of the most infamous gulags).

[citation needed] The right bank of the lower Svir is occupied by the Nizhnesvirsky Nature Reserve, established in 1980.