Grudusk [ˈɡrudusk] is a village in Ciechanów County, Masovian Voivodeship, in east-central Poland.

It is the seat of the gmina (administrative district) called Gmina Grudusk.

[1] It lies approximately 22 kilometres (14 mi) north of Ciechanów and 97 km (60 mi) north of Warsaw.

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