Chief of staff
Chief of staff was a title given to a senior member of a service organization or agency. This individual was usually responsible for overseeing the various branches of the service.

In 2293, General  was Chancellor Gorkon's chief of staff. () 

In 2365, Elizabeth Vallis served as Prime Minister Wilson Granger's chief of staff at the Mariposa colony. ()

In 2366, Ki Mendrossen served as Ambassador Sarek's personal chief of staff. ()

Starfleet chiefs of staff 
The chief of staff had an office at Starfleet Command's Fleet Operations Center, San Francisco, Sol Sector. (, directories; , set artwork)

In 2372, Weyoun made a proposal to Captain Benjamin Sisko that the Dominion would make him absolute ruler of the Federation, with "no President or Starfleet chief of staff." ()

In 2401, the dedication plaque of the  listed seven chiefs of staff. ()

The following individuals served as Starfleet chief of staff:
  – 2155
 Admiral Jonathan Archer – 2169
 R. Roddenberry – 23rd century
  – 23rd century, mirror universe
 T. Roth – 23rd century
  – 23rd century, mirror universe
 Fleet Admiral Bob (last name unknown) – 2287
 Admiral  – 24th century
 Admiral  – 2363 – 2401
  (2401)
  (2401)
  (2401)
  (2401)
  (2401)
  (2401)

See also 
 Commander-in-chief
 Commander, Starfleet

External link 
 

fr:Chef d'Etat-major
Titles
Starfleet