Duchy of Łęczyca Księstwo łęczyckie (pl)
1231–1352
Coat of arms
Status	Province of Poland
Capital	Łęczyca
Religion	Roman Catholic
Government	Duchy
Historical era	High Middle Ages
• Established	1231
• Incorporated by the    Polish Kingdom	1352
Succeeded by Łęczyca Voivodeship

Duchy of Łęczyca (Polish: Księstwo łęczyckie) was one of the duchies of Poland. It was created around 1231 from the Seniorate Province by Konrad I of Masovia. In 1264 the Duchy of Sieradz was split from it. The last duke of this duchy was Władysław the Hunchback. After his death in 1352 the duchy became part of the Kingdom of Poland and was reorganized into the Łęczyca Voivodeship.