The Intelligence Section is the main unit that Chicago PD focuses on. The unit is notorious for bending the rules to catch serious offenders but are commended due to their bravery, skills and ability to complete more cases than any other unit within the Chicago Police Department.
- Hank Voight (Sergeant/Unit Leader)
- Alvin Olinsky (Detective)
- Erin Lindsay (Detective)
- Jay Halstead (Detective)
- Kevin Atwater (Detective)
- Adam Ruzek (Officer)
- Kim Burgess (Officer)
- Julie Willhite - Deceased † (Killed in the Line of Duty)
- Sheldon Jin - Deceased † (Killed while off duty)
- Nadia Decotis - Deceased † (Killed, off duty civilian)
- Mouse - Resigned from the department.
- Antonio Dawson - Resigned from the department.