Momajny [mɔˈmai̯nɨ] (German Momehnen) is a village in the administrative district of Gmina Barciany, within Kętrzyn County, Warmian-Masurian Voivodeship, in northern Poland, close to the border with the Kaliningrad Oblast of Russia. It lies approximately 12 kilometres (7 mi) north of Barciany, 26 km (16 mi) north of Kętrzyn, and 79 km (49 mi) north-east of the regional capital Olsztyn.