Chief of security
The chief of security (also known as security chief, head of security, or chief security officer) was the officer in charge of security aboard a starship or starbase.

In the United Earth Starfleet, the armory officer was in charge of a ship's security division.

In the 2270s, the role of security chief was combined with that of the chief tactical officer. These officers were also in charge of weapons, shields, and ship security.  The chief tactical officer could be a separate position or be combined with that of helmsman or navigator. (; ; )

In the 24th century, with helm and navigation consolidated in the new flight control officer position, the chief tactical officer fulfilled the role of security chief. () Aboard the , Lieutenant Commander Tuvok, as security chief, had thirteen department heads report to him every day on ship's protocol. () The ship's security chief was responsible for initiating shipboard security alerts. () The conducting of personnel reviews was also among the chief's duties. ()

On some starbases, such as Deep Space 9, the chief of security was a separate position from the tactical officer and was also referred to as head of security. ()

List of security chiefs
Deep Space 9
Odo (Chief of security)
Lieutenant Commander Michael Eddington (Chief of Starfleet security)

 Lieutenant Shaxs
 Lieutenant Kayshon

 Commander Ellen Landry
 Lieutenant  
 Commander D. Nhan
Terok Nor
 Thrax

Lieutenant Malcolm Reed (armory officer)

Lieutenant 

Lieutenant La'an Noonien-Singh (2259)
Security chief (2267)
Lieutenant Commander Giotto (2267)
Lieutenant  (2267; Security chief)
Lieutenant Freeman (2268; Security chief)
Lieutenant Dickerson (2269; Chief security guard)
Lieutenant Pavel Chekov (2270s)

Lieutenant Natasha Yar (chief tactical officer)
Lieutenant / Lieutenant Commander Worf (chief tactical officer)

Lieutenant  (security chief)

Lieutenant Morgan Kelly
Prophet's Landing
 Bemar
Starfleet Headquarters
 Lieutenant Audrey Willa (3189)

Lieutenant / Lieutenant Commander Tuvok (chief tactical officer)

See also
Chief of Starfleet Security 

de:Sicherheitschef
ja:保安部長
nl:Hoofdbeveiliging
Titles