Chief tactical officer
Chief tactical officer was a senior position for Starfleet officers on board starships and starbases. Tactical officers were in charge of tactical operations, including weapons and shields, and ship's security.

The chief tactical officer was often, but not always, also the chief of security.

This position was an evolution of the armory officer position assigned to Earth Starfleet ships in the 22nd century. ()

On board  starships in the early to mid 23rd century, the tactical officer did not have a bridge station, as weapons control was handled by the navigator or helmsman when needed, and security was handled by the ship's security officers. (; ) However, from the 2270s the tactical station was added to the bridge, from which was controlled the photon torpedoes and deflector screens. (; )

By the 24th century, tactical officers aboard  starships were also typically charged with communications duties. ()

Chief tactical officers 
 Gen Rhys ()
 Pavel Chekov ( [refit] and )
 Natasha Yar ()
 Worf ( and )
  ()
 Tuvok ()
Titles