Siwiki [ɕiˈviki] is a village in the administrative district of Gmina Zbójna, within Łomża County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 10 kilometres (6 mi) north of Zbójna, 27 km (17 mi) north-west of Łomża, and 95 km (59 mi) west of the regional capital Białystok.