Sojczynek [sɔi̯ˈt͡ʂɨnɛk] is a village in the administrative district of Gmina Grajewo, within Grajewo County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 20 kilometres (12 mi) south of Grajewo and 59 km (37 mi) north-west of the regional capital Białystok.