Ciwoniuki [t͡ɕivɔˈɲuki] is a village in the administrative district of Gmina Michałowo, within Białystok County, Podlaskie Voivodeship, in north-eastern Poland, close to the border with Belarus. It lies approximately 9 kilometres (6 mi) south-east of Michałowo and 40 km (25 mi) east of the regional capital Białystok.