The Brześć Kujawski Voivodeship (Polish: Województwo brzesko-kujawskie, Latin: Palatinatus Brestensis) was a unit of administrative division and local government in the Kingdom of Poland (later Polish–Lithuanian Commonwealth), from the 14th century to the Second Partition of Poland in 1793.

Zygmunt Gloger in his monumental book Historical Geography of the Lands of Old Poland provides this description of Brześć Kujawski Voivodeship: “East of the land of the Polans lies the region of Kujawy, most of which stretches along left bank of the Vistula.

Duke Boleslaw Krzywousty, while writing his testament in 1138, united Kujawy and Mazovia, giving it to his son Boleslaw IV the Curly (...) The dynasty of Mazovian Piasts lasted until the 16th century, while the Kujawian Piasts died out in the 14th century.

As a result, Kujawy returned to the Crown of the Kingdom of Poland in 1434, two hundred years before Mazovia.

Since both Brześć Kujawski and Inowrocław voivodeships were part of Kujawy, local sejmiks for them took place at Radziejow.