Łęczyca Voivodeship (Polish: Województwo łęczyckie) was a unit of administrative division and local government in Poland from the 14th century until the partitions of Poland in 1772–1795. It was part of Greater Poland Province, and its capital was in Łęczyca. The voivodeship had the area of 4,080 square kilometers, divided into three counties. Local sejmiks took place at Łęczyca. The city of Łódź, which until the 19th century was a small town, for centuries belonged to Łęczyca Voivodeship.
Greater Poland, often known by its Polish name Wielkopolska (Polish: [vjɛlkɔˈpɔlska] ; Latin: Polonia Maior), is a Polish historical region of west-central Poland. Its chief and largest city is Poznań followed by Kalisz, the oldest city in Poland.
The boundaries of Greater Poland have varied somewhat throughout history. Since the Late Middle Ages, Wielkopolska proper has been split into the Poznań and Kalisz voivodeships. In the wider sense, it also encompassed Sieradz, Łęczyca, Brześć Kujawski and Inowrocław voivodeships (the last two known as Kuyavian) which were situated further east, and the Santok Land, located to the northwest. The region in the proper sense roughly coincides with the present-day Greater Poland Voivodeship (Polish: województwo wielkopolskie).