Kosówka is a village in the administrative district of Gmina Rajgród, within Grajewo County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 13 km south-west of Rajgród, 6 km north-east of Grajewo, and 77 km north-west of the regional capital Białystok. It is located within the historic region of Podlachia.

History

It is a former royal village of the Polish Crown. During the German occupation of Poland during World War II, on July 15, 1943, in the Kosówka forest, the German gendarmerie in cooperation with the Gestapo murdered about 150 Poles, most of them inhabitants of the nearby town of Grajewo. On January 20, 1945, the Germans committed another murder in the Kosówka forest, killing 300 Poles. A memorial dedicated to the victims was erected in Kosówka in 1959.