Section 31 personnel
Members of Section 31.

22nd century 

Malcolm Reed (former)

23rd century 
 Gabrielle Burnham
 Mike Burnham
 Kamran Gant
 
 Leland
 Patar

Unnamed

Andorian admiral 

This admiral, along with Admiral Patar, a Tellarite Admiral and a Human Admiral conferred with Section 31 operatives Leland and  about the further search for Spock and Michael Burnham. ()

Discovery crewman 

This member of the  crew wore tactical gear with a black Starfleet insignia instead of the usual division colored insignia, which was noted as unusual by . ()

Engineer  

This member of Section 31 served as an engineer in the 23rd century. ()

Human admiral 
This admiral, along with Admiral Patar, a Tellarite Admiral and an Andorian Admiral conferred with Section 31 operatives Leland and  about the further search for Spock and Michael Burnham. ()

Tellarite admiral  

This Admiral, along with three others: the Vulcan Patar, as well as a Human and an Andorian admiral, were members of the Section 31 High Command and were killed by the rogue artificial intelligence called Control. ()

Control assumed the identities of the admirals it murdered and used their holograms to confer with Section 31 operatives Leland and  about the further search for Spock and Michael Burnham in 2257. ()

Alternate reality 
Admiral 
  aka John Harrison
Thomas Harewood

Unnamed

24th century 
Luther Sloan
Koval (double agent)
Julian Bashir (unofficial and unwilling)

Furthermore, Admiral William Ross was known to sympathize with Section 31 to the point of willingly turning a blind eye to their activities. ()

Unnamed

Operatives 

These operatives accompanied Luther Sloan, an officer from Starfleet Department of Internal Affairs, when he arrived at Deep Space 9 and accused Dr. Julian Bashir of being a Dominion spy. ()

Morphogenic virus plot conspirators  
According to Bashir, at least seventy-three computer experts, doctors, security officers, admirals and clerks were involved with the plot to infect Odo with the morphogenic virus. ()

See also 
People in Luther Sloan's memory
Unnamed Andorians
Unnamed Humans
Unnamed Tellarites
Unnamed Starfleet personnel (23rd century)
Unnamed Starfleet personnel (24th century)