Piekiełko [pjɛˈkʲɛu̯kɔ] is part of the town in Mława in Masovian Voivodeship, east-central Poland.

Until 2004 it was a village in the administrative district of Gmina Iłowo-Osada, within Działdowo County, Warmian-Masurian Voivodeship.

It lies approximately 5 kilometres (3 mi) east of Iłowo-Osada and 14 km (9 mi) south-east of Działdowo.

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