Lake Virmayarvi (; ) is a small ( long) lake straddling the border between Finland (Ilomantsi municipality) and Russia (Suoyarvsky District, Republic of Karelia). The lake has an area of , of which belongs to Finland and to Russia. Its surface elevation is above sea level.
The lake is located east of the village of Hattuvaara. The easternmost point of Finland and of the continental European Union is located on an island in the lake. A national border has passed through Virmajärvi since 1621, when the Swedish–Russian border was demarcated following the Treaty of Stolbovo of 1617. The current border was established in 1940 after the Moscow Peace Treaty.
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