Department

A department was a major division or subdivision within the structure of an organization. 
According to Luther Sloan, Section 31 was "an autonomous department", a branch of Starfleet Intelligence that operated with the intent of protecting the Federation's best interests, meaning that they "don't submit reports or ask for approval for specific operations." ()
== Specific departments ==
===Earth===
* Internal Affairs
* Detroit Department of Health
* Police department
** Detroit Police Department
** Los Angeles Police Department
** New York City Police Department
** Portage Creek Police Department
** San Francisco Police Department
* San Francisco Department of Sanitation
===United Federation of Planets===
* Bureau of Planetary Treaties
* Department of Cartography
* Department of Investigation
* Department of Foreign Studies
* Department of Temporal Investigations
* Macalintal Physics Department
* Temporal Mechanics Department
* Section 31