Rostkowo [rɔstˈkɔvɔ] is a village in the administrative district of Gmina Czernice Borowe, within Przasnysz County, Masovian Voivodeship, in east-central Poland. It lies approximately 7 kilometres (4 mi) south-east of Czernice Borowe, 6 km (4 mi) west of Przasnysz, and 89 km (55 mi) north of Warsaw.

The village is the birthplace of saint Stanislaus Kostka. The church in Rostkowo is his sanctuary.