Department may refer to:
* Departmentalization, division of a larger organization into parts with specific responsibility
Government and military
*Department (administrative division), a geographical and administrative division within a country, for example:
**Departments of Argentina, the second level of administrative division in Argentina, below the provinces
**Departments of Chile
**Departments of Colombia, a grouping of municipalities
**Departments of France, administrative divisions three levels below the national government
**Departments of Honduras
**Departments of Peru, name given to the subdivisions of Peru until 2002
**Departments of Uruguay
*Department (United States Army), corps areas of the U.S. Army prior to World War I
*Fire department, a public or private organization that provides emergency firefighting and rescue services
*Ministry (government department), a specialized division of a government
*Police department, a body empowered by the state to enforce the law
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