Knis [knis] is a village in the administrative district of Gmina Ryn, within Giżycko County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 6 kilometres (4 mi) north of Ryn, 17 km (11 mi) south-west of Giżycko, and 72 km (45 mi) east of the regional capital Olsztyn.