Stadniki [stadˈniki] is a village in the administrative district of Gmina Grodzisk, within Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 6 kilometres (4 mi) south of Grodzisk, 16 km (10 mi) north-west of Siemiatycze, and 72 km (45 mi) south-west of the regional capital Białystok.