Osieczek [ɔˈɕɛt͡ʂɛk] is a village in the administrative district of Gmina Książki, within Wąbrzeźno County, Kuyavian-Pomeranian Voivodeship, in north-central Poland.

[2] It was located on the shore of Jezioro Wielkie, about 750 m north-east of the present day village centre.

The village was owned by Jeśke von ritter Mosseken (Jan from Osieczek) at the time.

He owned 2621 włóka of land, 118 buildings, 72 houses, 3 inns, a watermill, a brewery and a distillery.

The statues at the outskirts of the village, under which the dead sick were buried, are a preserved remnant of those events.

Towards the end of the 17th century, the Działyński family gave Osieczek to Benedictine nuns from Grudziądz who moved into the village.