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This is a list of characters in the American science fiction crime drama television series Person of Interest.

John Reese (played by Jim Caviezel) is the name adopted by the former U.S. Army Special Forces soldier and Central Intelligence Agency (CIA) officer who serves as Finch's armed enforcer used to stop future crimes. Presumed dead following a failed CIA operation in China, Reese's real name is unknown. He was nicknamed "The Man in the Suit" by law enforcement, who know him only in terms of the description given by witnesses.

Harold Finch (played by Michael Emerson) is a reclusive billionaire software engineer who built a machine that predicts future crimes and outputs either the victim's or perpetrator's Social Security number. He is known by a series of bird-themed aliases such as Harold Wren, Harold Crow, and Harold Swift . Finch is very secretive and highly conscious of digital security, and has successfully erased his own digital footprint. A frequent companion of Finch is a dog named Bear (played by Graubaer's Boker ). Bear is a Belgian Malinois with military training who Reese rescues from Aryan Nationalists, who were using him as an attack dog.

Sameen Shaw (played by Sarah Shahi) is a former U.S. Marine and a US Army ISA operative, first seen as an assassin working for "The Program", the section of the Government dealing with the "relevant" numbers found by The Machine (S2 Ep16, "Relevance"). Her ISA partner Cole begins to have doubts after one of their targets proves to be an engineer working for the government; the assassination is part of the cover-up that conceals the existence of The Machine. As a result, her employers targets her and her partner and plans a trap to assassinate them. Shaw and Cole's numbers were given to Reese and Finch. That night, Cole is killed. Reese and Finch continues to try helping her and although she initially declines a couple of times, she ends up subsequently working with them on a regular basis. She likes dogs and buys Bear an expensive collar and other presents.

Samantha 'Root' Groves has not been a contender in any CBUB matches.