|For information relating to the chief of security in Star Trek canon, see chief of security. For more information relating to the chief of security in Star Trek fanon, see security chief.|
In Starfleet, the chief of security was the crewmember in charge of the security of a starship, space station, or other installation. This position was also known as security chief, head of security or chief security officer. Aboard a starship, this position was also combined with the chief tactical officer. The chief of security usually took the tactical station on the bridge.