Osewo [ɔˈsɛvɔ] is a settlement in the administrative district of Gmina Kętrzyn, within Kętrzyn County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 10 kilometres (6 mi) east of Kętrzyn and 74 km (46 mi) north-east of the regional capital Olsztyn.