Leszczka Duża [ˈlɛʂt͡ʂka ˈduʐa] is a village in the administrative district of Gmina Perlejewo, within Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 3 kilometres (2 mi) north-west of Perlejewo, 28 km (17 mi) north-west of Siemiatycze, and 73 km (45 mi) south-west of the regional capital Białystok.