Marcinowo [mart͡ɕiˈnɔvɔ] is a village in the administrative district of Gmina Kalinowo, within Ełk County, Warmian-Masurian Voivodeship, in northern Poland. It lies approximately 3 kilometres (2 mi) north of Kalinowo, 22 km (14 mi) north-east of Ełk, and 143 km (89 mi) east of the regional capital Olsztyn.