Navy Department
Navy Department or Department of the Navy may refer to:
- United States Department of the Navy
 - Navy Department (Ministry of Defence), in the United Kingdom, 1964–1997
 - Confederate States Department of the Navy, 1861–1865
 - Department of the Navy (Australia), 1939–1973
 
See also
- Department of Naval Services, in Canada, 1910–1922
 - Ministry of the Navy (disambiguation)