Moszczona Królewska [mɔʂˈt͡ʂɔna kruˈlɛfska] is a village in the administrative district of Gmina Mielnik, within Siemiatycze County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Belarus. It lies approximately 7 kilometres (4 mi) north-west of Mielnik, 11 km (7 mi) south-east of Siemiatycze, and 83 km (52 mi) south of the regional capital Białystok.