Chojnówek [xɔi̯ˈnuvɛk] is a village in the administrative district of Gmina Grajewo, within Grajewo County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 7 kilometres (4 mi) west of Grajewo and 79 km (49 mi) north-west of the regional capital Białystok.