Siedlce Department
![](http://upload.wikimedia.org/wikipedia/commons/thumb/c/cb/Podzial_Ks_Warszawskiego_na_departamenty.png/200px-Podzial_Ks_Warszawskiego_na_departamenty.png)
Siedlce Department (Polish: Departament siedlecki) was a unit of administrative division and local government in Polish Duchy of Warsaw in years 1809–1815.
Its capital city was Siedlce, and it was further divided onto 9 powiats.
In 1815 it was transformed into Podlasie Voivodeship.
52°09′00″N 22°16′00″E / 52.150000°N 22.266667°E / 52.150000; 22.266667
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