A Person of Interest is an individual who will be involved in a violent crime. The Machine, without indicating whether the individual is the victim or the perpetrator, supplies his or her Social Security number to Reese and Finch, who study their background and attempt to prevent the violent crime.
Since Season 1, the intro will provide some scenes from the episode. Starting with "Masquerade", an ID is shown with the Person of Interest.
- Main article: Persons of Interest (Season 1)
- Main article: Persons of Interest (Season 2)
- Leon Tao ("The Contingency") ("Critical") ("All In")
- Nicholas Donnelly ("Prisoner's Dilemma")
- Kara Stanton ("Dead Reckoning")
- Samantha Shaw ("Relevance")
- Cal Beecher ("Trojan Horse")
- Ernest Thornhill ("Zero Day")
Persons of Interest who either appeared in a flashback or in a side arc providing background information relevant to the main event.
- Main article: Persons of Interest (other Numbers)
- Main article: Relevant Numbers