Kaczynek [kaˈt͡ʂɨnɛk] is a village in the administrative district of Gmina Szumowo, within Zambrów County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 10 kilometres (6 mi) north-west of Szumowo, 17 km (11 mi) west of Zambrów, and 80 km (50 mi) west of the regional capital Białystok.