Opoczno ( ) is a town in south-central Poland, seat of Opoczno County in the Łódź Voivodeship. It has a long and rich history, and in the past it used to be one of the most important urban centers of northwestern Lesser Poland. Currently, Opoczno is an important road and rail junction; its patron saint is Saint Cecilia, and the town is famous across Poland for its folklore.

Łódź Voivodeship is a voivodeship (province) of Poland. It was created on 1 January 1999 out of the former Łódź Voivodeship (1975–1999) and the Sieradz, Piotrków Trybunalski and Skierniewice Voivodeships and part of Płock Voivodeship, pursuant to the Polish local government reforms adopted in 1998. The province is named after its capital and largest city, Łódź, pronounced.