Konstantynów Łódzki [kɔnstanˈtɨnuf ˈwut͡skʲi] is a town in Pabianice County, Łódź Voivodeship, in central Poland, with 18,335 inhabitants (2020).

[1] It borders Łódź to the east, Lutomiersk to the west, Aleksandrów Łódzki to the north, and Porszewice to the south.

It was founded in the 1820s by a landowner who had planned to build a textile industry there.

In 1821 Konstantynów Łódzki, at that time still a village, became a part of the textile industry of the Łódź region.

Following the German-Soviet invasion of Poland, which started World War II in September 1939, it was occupied by Germany until 1945.