Płońsk is a town in central Poland with 21,591 inhabitants (2022). Situated at the Płonka river in the historic region of Mazovia, it is the seat of Płońsk County in the Masovian Voivodeship.

Mazovia or Masovia is a historical region in mid-north-eastern Poland. It spans the North European Plain, roughly between Łódź and Białystok, with Warsaw being the unofficial capital and largest city. Throughout the centuries, Mazovia developed a separate sub-culture featuring diverse folk songs, architecture, dress and traditions different from those of other Poles.