Janówek [jaˈnuvɛk] is a village in the administrative district of Gmina Pacyna, within Gostynin County, Masovian Voivodeship, in east-central Poland. It lies approximately 3 kilometres (2 mi) north-east of Pacyna, 22 km (14 mi) south-east of Gostynin, and 87 km (54 mi) west of Warsaw.