Warsaw Department

Warsaw Department (Polish: Departament warszawski) was a unit of administrative division and local government in the Duchy of Warsaw in years 1806–1815. Its capital was Warsaw.

Administrative division: 10 counties

 * Błonie County
 * Brzezin County
 * Czersk County
 * Gostynin County
 * Łęczyca County
 * Orłów County
 * Rawa Mazowiecka County
 * Sochaczew County
 * Warszawa County
 * Zgiersk County
 * Siennick County (1810)
 * Stanisławow County (1810)

In 1815 it was transformed into Masovian Voivodeship.