Gniazdowo [ɡɲazˈdɔvɔ] is a village in the administrative district of Gmina Stary Lubotyń, within Ostrów Mazowiecka County, Masovian Voivodeship, in east-central Poland.

[1] It lies approximately 4 kilometres (2 mi) west of Stary Lubotyń, 15 km (9 mi) north of Ostrów Mazowiecka, and 100 km (62 mi) north-east of Warsaw.

In 1827, Gniazdowo had a population of 222.

[2] During the German invasion of Poland which started World War II, on September 10, 1939, German troops carried out a massacre of some 20 Poles (see Nazi crimes against the Polish nation).

This Ostrów Mazowiecka County location article is a stub.