Boleszyn [bɔˈlɛʂɨn] is a village in the administrative district of Gmina Grodziczno, within Nowe Miasto County, Warmian-Masurian Voivodeship, in northern Poland.

In the second half of the 16th century the commune included the villages: Boleszyn, Wielekie, Leźno, Sugajno, Słup and Zalesie.

During the First World War, in August 1914, the Imperial Russian Army invaded the Lubawa area and briefly occupied Boleszyn.

[3] During the Second World War (1939-1945), after the invasion of Poland, Boleszyn was incorporated into the Strasburg County (West Prussia) and renamed Bolleschin.

[5] After the Treaty of Versailles came into force on January 10, 1920, the County of Strasburg became part of the Republic of Poland and was assigned to the Powiat Brodnicki, whereby Boleszyn lost its right as an administrative district.

With the end of the Second World War, the area of the government region Marienwerder then came to the Polish People's Republic.

[7][8] On September 15, 2015, a memorial plaque for the martyr Franz Boehm was inaugurated by Bishop Andrzej Suski of Toruń.

[9] An urn filled with soil from the Dachau concentration camp is intended to commemorate the life and suffering of the resistance fighter against National Socialism.