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Unnamed Starfleet Headquarters personnel:

Air tram station Edit

Civilians Edit

These civilians were present at Starfleet Headquarters when Rear Admiral James Kirk and Lieutenant commander Sonak met there, in 2273. (Star Trek: The Motion Picture)

They were played by unknown performers.

Federation civilian Edit

Green Whitaker tmp — A Federation civilian

This civilian was also present at the air tram station in 2273. (Star Trek: The Motion Picture)

Played by Green Whitaker.

Starfleet personnel Edit

These Starfleet personnel were present at the Air tram station for Starfleet Headquarters in 2273, when Rear Admiral James Kirk arrived to the complex and met Lieutenant Commander Sonak. (Star Trek: The Motion Picture)

They were played by unknown performers.

Officer's lounge Edit

Officers in lounge Edit

These Starfleet officers were present in the officer's lounge when Admiral James Kirk and Fleet Admiral Morrow had a conversation there in 2285. (Star Trek III: The Search for Spock)

They were played by unknown performers.

Officer's lounge civilian Edit

This civilian man was present at the officer's lounge, conversating with two Starfleet officers when Admiral Kirk and Fleet Admiral Morrow had a conversation there in 2285. (Star Trek III: The Search for Spock)

He was played by an unknown performer.

Officer's lounge waiter Edit

This Starfleet waiter was working at the officer's lounge when Admiral Kirk and Fleet Admiral Morrow had a conversation there in 2285. (Star Trek III: The Search for Spock)

He was played by an unknown performer.

Officer's wife Edit

This woman visited the officer's lounge in 2285. She was present when Admiral Kirk and Fleet Admiral Morrow had a conversation. (Star Trek III: The Search for Spock)

She was played by background actress Claudia Lowndes who received no on-screen credit for her appearance.
Her name and occupation are from the name tag of her costume which was sold off on It's A Wrap! sale and auction on eBay. [1]

The Praxis briefing Edit

Aide de camp Edit

In 2293, this aide-de-camp was a Starfleet captain who opened the briefing about the destruction of Praxis, introducing the C-in-C.

In the script for Star Trek VI: The Undiscovered Country, this character's lines are attributed to an Admiral Donald, who otherwise was ultimately replaced with Admiral Cartwright.
This unnamed captain was played by Shakti.

Mothball admiral Edit

In 2293, this Starfleet flag officer attended the briefing about the Klingon moon Praxis. She apparently was familiar with the commander-in-chief, addressing him as Bill. She asked him if they intended to mothball Starfleet. (Star Trek VI: The Undiscovered Country)

As evidenced by the script for Star Trek VI: The Undiscovered Country, this character was initially meant to be "a military man".
This unnamed admiral was played by Judy Levitt, Walter Koenig's wife.
Although the C-in-C addressed her as "captain," she wore a flag officer's insignia. The only time that a person would normally be addressed as captain without possessing that rank would be in the case of being assigned command of a starship, which – as Kirk has shown us – is possible for admirals to do.

Briefing flag officers Edit

These Starfleet flag officers attended the briefing about the Klingon moon Praxis. (Star Trek VI: The Undiscovered Country)

Prison guards Edit

These two Starfleet prison guards served at the Starfleet Headquarters in 2285. They were responsible for Doctor McCoy, who was imprisoned after he tried to hire a ship in a bar which should bring him to Genesis.

The first guard allowed Admiral James T. Kirk access to McCoy's holding cell and was knocked out by Kirk. The second guard, a very tall man, was rendered unconscious when Sulu threw him over his shoulder. (Star Trek III: The Search for Spock)

The non-canon Star Trek Customizable Card Game gives the character played by Douglas Alan Shanklin the name Tahglio.

Prison security guards Edit

Two security guards

These two Starfleet security guards also served at the same holding cell in 2285, where McCoy was imprisoned. They were alarmed when Kirk and his crewmates escaped along with McCoy, but were late and couldn't capture them. (Star Trek III: The Search for Spock)

They were played by unknown performers.

Security officer (2364) Edit

This Starfleet security officer joined the dinner with Captain Jean-Luc Picard, Admiral Aaron, Admiral Savar, and Captain Tryla Scott at the Starfleet Headquarters on Earth in 2364. He was infected like the others by the neural parasites. When Commander Riker joined the dinner and tricked the others into believing he was also infected, he shot this security officer who hit the ground. (TNG: "Conspiracy")

This security officer was played by stunt actor Gary J. Wayton who received no credit for this appearance.

Starfleet Command Edit

Window technicians Edit

These four Starfleet technicians worked at Starfleet Command in 2286 when the Whale Probe arrived at Earth. They tried to stabilize the windows but failed. One of the windows exploded due to the rain and stormy weather. (Star Trek IV: The Voyage Home)

All four technicians were played by stunt performers.
Gregory Barnett's costume was sold off on the It's A Wrap! sale and auction on eBay. [2]