Uniejów [uˈɲɛjuf] is a spa town in Poddębice County, Łódź Voivodeship in central Poland, with 2,957 inhabitants (2020).

The town lies within the historic Sieradz Land, in northwestern corner of Poddębice County, near the border with Greater Poland Voivodeship.

[2] In the late 13th century, Archbishop Jakub Świnka founded Church of the Holy Spirit and a hospital, and in 1331, Uniejów was burned by the Teutonic Knights.

In September 1939, during the German invasion of Poland, which started World War II, Polish units of Poznań Army resisted here the advancing Wehrmacht.

[5] The Jewish population of Uniejów, numbering slightly over 1,000 was immediately brutalized by the invaders, kidnapped for forced labor, beaten, and robbed.

In 1940, they were moved into a ghetto in the more decrepit part of town and the following year, the entire Jewish population of around 500 was forced to live in four buildings.

[8] In October 1941, all the community's Jewish population was sent to a ghetto in Kowale Pańskie where in July 1942 most were sent to the Chełmno extermination camp where they were immediately gassed.

Men of the nationalist Polish underground murdered one survivor in the Turek Forest in late 1945, months after the war ended.

Positive opinions of people using the thermal bath, the natural and landscape potential of the Municipality, its tourist and recreational values prompted the local authorities to apply for the status of a health resort.