| Native Name: | Departament Warszawski |
| Conventional Long Name: | Warsaw Department |
| Common Name: | Warsaw |
| Subdivision: | Department |
| Nation: | the Duchy of Warsaw |
| Year Start: | 1806 |
| Year End: | 1815 |
| P1: | Warsaw Department |
| Flag P1: | Flag of the Kingdom of Prussia (1803-1892).svg |
| S1: | Masovian Voivodeship (1816–1837) |
| Flag S1: | Military ensign of Vistula Flotilla of Congress Poland.svg |
| Image Map Caption: | Administrative division of the Duchy of Warsaw, 1810–1815. Warsaw Department is navy blue in the center |
| Capital: | Warsaw |
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.[1]
In 1815 it was transformed into Masovian Voivodeship.