Leszczka [ˈlɛʂt͡ʂka] is a village in the administrative district of Gmina Siemiatycze, within Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 7 kilometres (4 mi) north of Siemiatycze and 73 km (45 mi) south of the regional capital Białystok.