Jaskółowo [jaskuˈwɔvɔ] is a village in the administrative district of Gmina Nasielsk, within Nowy Dwór County, Masovian Voivodeship, in east-central Poland. It lies approximately 9 kilometres (6 mi) south-east of Nasielsk, 22 km (14 mi) north-east of Nowy Dwór Mazowiecki, and 40 km (25 mi) north of Warsaw.