The Dorpat Voivodeship (Polish: Województwo dorpackie or województwo derpskie) was a unit of administrative division and local government in the Duchy of Livonia, part of the Polish–Lithuanian Commonwealth, from 1598 until the Swedish conquest of Livonia in the 1620s. The seat of the voivode was in the town of Dorpat (Tartu), while the regional assembly (sejmik) for the whole province of Livonia was located in Wenden. The area of the Dorpat Voivodeship was app. 9,000 square kilometers, and it had two senators in the Senate of the Polish–Lithuanian Commonwealth.