Siemiątkowo [ɕɛmjɔntˈkɔvɔ] is a village in Żuromin County, Masovian Voivodeship, in east-central Poland. It is the seat of the gmina (administrative district) called Gmina Siemiątkowo. It lies approximately 23 kilometres (14 mi) south-east of Żuromin and 99 km (62 mi) north-west of Warsaw.