Masuny [maˈsunɨ] is a village in the administrative district of Gmina Sępopol, within Bartoszyce County, Warmian-Masurian Voivodeship, in northern Poland, close to the border with the Kaliningrad Oblast of Russia. It lies approximately 7 kilometres (4 mi) north-east of Sępopol, 18 km (11 mi) north-east of Bartoszyce, and 70 km (43 mi) north-east of the regional capital Olsztyn.

• Karl von Gamp-Massaunen (1846-1918), German landowner and politician, member of Reichstag