Starfleet Intelligence personnel
Members of Starfleet Intelligence.

Named
 Gannet
 Chadwick
 Rear Admiral Erik Pressman
 Vice Admiral Fujisaki
 Miles O'Brien (briefly, for a special assignment)
 Jake Sisko (allegedly)
 Nog (allegedly)
 Director Okaro (in an alternate timeline)

Unnamed

Brooks' division head 
Travis Mayweather questioned "reporter" Gannet Brooks' 2155 assertion that she was an agent for SI rather than a Terra Prime operative, saying that she ought to be able to leave the brig of  with one call to her division head. Brooks countered that by noting that her true identity would be exposed to everyone onboard, including the actual operative. ()

Chief of Intelligence 
According to Vice Admiral Margaret Blackwell, the chief of Starfleet Intelligence herself was observing Jean-Luc Picard's 2370 attempt to retrieve of the  and that he should follow Erik Pressman's orders and ask no further questions. ()

Odo's friend(s) 
Odo had "friends" in SI, one of whom, a female, had heard from her male friend, who had a male cousin, who was married to the female assistant of one of the members of the Federation Medical Council, who heard that Doctor April Wade was not going to win the Carrington Award in 2371. ()

Odo also claimed that a SI friend used to be assigned to the Federation Embassy on Qo'noS, and put Odo in touch with a former Klingon operative who has fallen out of favor with their current government. ()

Pressman's cohorts 
According to Picard, Admiral Pressman and several other members of SI would likely face a general court martial following the Pegasus incident. ()

Undercover operatives 
In a 2374 meeting with Miles O'Brien, Chadwick revealed that the Orion Syndicate had killed
another undercover operative a week prior, bringing the total that year to five dead. ()

Unnamed individuals
Unnamed Humans
Unnamed Starfleet personnel (22nd century)
Unnamed Starfleet personnel (24th century)