Muszaki is a village in the administrative district of Gmina Janowo, within Nidzica County, Warmian-Masurian Voivodeship, in northern Poland. It is located in Masuria.
As of 1600, the population of the village was solely Polish. As of 1877, the village had a population of 468, Polish by ethnicity, mostly living off potato cultivation and sheep farming.
During World War II, in 1943, Polish partisans of the Home Army disarmed a German gendarmerie post in the village.