Słoszewo-Kolonia [swɔˈʂɛvɔ kɔˈlɔɲa] is a village in the administrative district of Gmina Płońsk, within Płońsk County, Masovian Voivodeship, in east-central Poland. It lies approximately 4 kilometres (2 mi) north of Płońsk and 65 km (40 mi) north-west of Warsaw.