Lyasnaya (Belarusian: Лясная, romanized: Liasnaja; Russian: Лесная, romanized: Lesnaya; Polish: Leśna) is an agrotown in Baranavichy District, Brest Region, western Belarus.

In the interbellum, Leśna, as it was known in Polish, was administratively located in the Baranowicze County in the Nowogródek Voivodeship of Poland.

[2] Following the invasion of Poland in September 1939, Leśna was first occupied by the Soviet Union until 1941, then by Nazi Germany until 1944.

The Germans operated the Stalag 337 prisoner-of-war camp for some 50,000 POWs at the local railway station with additional subcamps in Baranowicze and Slutsk.

[1] In 1944, the settlement was re-occupied by the Soviet Union, which eventually annexed it from Poland in 1945.