Sieradz Voivodeship (Polish: Województwo sieradzkie, Latin: Palatinatus Siradiensis) was a unit of administrative division and local government in the Crown of the Kingdom of Poland and the Polish–Lithuanian Commonwealth, from 1339 to the second partition of Poland in 1793. It was a part of the Greater Poland Province.
The seat of the voivode was in Sieradz, while local sejmiks took place in Szadek.