Janiszewo [janiˈʂɛvɔ] is a settlement in the administrative district of Gmina Sorkwity, within Mrągowo County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 5 kilometres (3 mi) north-west of Sorkwity, 13 km (8 mi) west of Mrągowo, and 42 km (26 mi) east of the regional capital Olsztyn.