Cięćk [t͡ɕɛnt͡ɕk] is a village in the administrative district of Gmina Myszyniec, within Ostrołęka County, Masovian Voivodeship, in east-central Poland. It lies approximately 9 kilometres (6 mi) east of Myszyniec, 36 km (22 mi) north of Ostrołęka, and 134 km (83 mi) north of Warsaw.