Raciąż [ˈrat͡ɕɔ̃ʂ] is a town in Płońsk County, Masovian Voivodeship, Poland, with 4,642 inhabitants (2010).

Raciąż was granted town rights in 1425 by Siemowit IV, Duke of Masovia.

It was located on a trade route connecting Toruń with Brześć.

Between 1857 and 1931, the Jewish population of the town varied between 35% and 45%, which was typical of small shtetls in the region.

The German invaders rounded up most of the Jews and deported them to Warsaw and other larger towns in 1939.