The Masurians or Mazurs (, ) were a Lechitic sub-ethnic group in the Warmian-Masurian Voivodeship in Poland. They are descended from Masovians (; ), Polish settlers from Masovia who moved to Prussia especially during and after the Protestant Reformation and who were primarily Protestant. In the 19th century, the Masuria region of East Prussia was named after the Masurians. After World War II many Masurians were classified as Germans and expelled  to West Germany or emigrated after 1956.

The Masurians or Mazurs (, ) were a Lechitic sub-ethnic group in the Warmian-Masurian Voivodeship in Poland. They are descended from Masovians (; ), Polish settlers from Masovia who moved to Prussia especially during and after the Protestant Reformation and who were primarily Protestant. In the 19th century, the Masuria region of East Prussia was named after the Masurians. After World War II many Masurians were classified as Germans and expelled  to West Germany or emigrated after 1956.