War Department
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War Department or Department of War may refer to current and historical ministries of defence, including:
- War Department (United Kingdom), 1747–1857
- War Office, British war department, 1857–1964
- United States Department of War, 1789–1947
- United States Department of Defense, 1949–present (National Military Establishment, 1947–1949); using "Department of War" as a secondary name since 2025