Krupin [ˈkrupin] is a village in the administrative district of Gmina Prostki, within Ełk County, Warmian-Masurian Voivodeship, in north-eastern Poland.

[1] It is located in the historic region of Masuria.

Since its establishment, Krupin was an ethnically Polish village.

[2] Various Polish nobility lived there, including the Ciesielski, Wilkowski and Dulski families.

This Ełk County location article is a stub.