남부 보스턴 매사추세츠 주 경찰청은 프랭크 코스텔로가 이끄는 막강한 세력을 지닌 보스턴 최대 범죄조직망을 일망타진하기 위해 신참 경찰 빌리 코스티건을 조직에 침투시킨다. 빌리가 경찰 뱃지를 반납하고 보스턴 길거리를 떠돌다 코스텔로의 신임을 얻기 위해 애쓰는 동안 또 다른 신참 콜린 설리반은 경찰청 내에서 승승장구하여 특별 수사반에 배치된다. 특별 수사반의 임무 역시 코스텔러를 제거하는 것. 그러나 사실 콜린은 경찰청에 투입된 코스텔로의 첩자. 경찰청의 동태를 사전에 코스텔로에게 알리는 게 그의 진짜 임무였던 것이다.
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Jack Nicholson
Francis 'Frank' Costello
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Leonardo DiCaprio
William "Billy" Costigan, Jr.
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Matt Damon
Staff Sgt. Colin Sullivan
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Mark Wahlberg
Staff Sgt. Sean Dignam
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Vera Farmiga
Dr. Madolyn Madden
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Martin Sheen
Capt. Oliver Charles Queenan
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Ray Winstone
Arnold "Frenchy" French
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Anthony Anderson
Trooper Brown
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Alec Baldwin
Capt. George Ellerby
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Kevin Corrigan
Cousin Sean
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James Badge Dale
Barrigan
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David O'Hara
Fitzy
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Robert Wahlberg
Lazio
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Kristen Dalton
Gwen
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Chance Kelly
Exam Instructor
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Larry Mitchell
Younger Priest
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Mark Rolston
Delahunt
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J. C. MacKenzie
Realtor
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Peg Holzemer
Mrs. Kennefick
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Gurdeep Singh
Pakistani Proprietor
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Armen Garo
Providence Gangster #1
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John Cenatiempo
Providence Gangster #2
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Brian Smyj
Man Glassed in Bar
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Dorothy Lyman
Woman at Bar #1
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Audrie Neenan
Woman at Bar #2
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Conor Donovan
Young Colin
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Patrick Coppola
Bookie Harassed by French
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Mick O'Rourke
Jimmy Bags
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Nellie Sciutto
Queenan's Secretary
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Henry Yuk
Chinese Government Man
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John Rue
Luncheonette Proprietor
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John Farrer
Priest at Billy's Funeral
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Billy Smith
Detective #1 Tailing Queenan
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Brian Haley
Detective #2 Tailing Queenan
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Terry Serpico
Detective #3 Tailing Queenan
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Jay Giannone
Detective #4 Tailing Queenan
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Tracey Paleo
Darlene the Secretary
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Jill Brown
Executed Woman
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Tom Kemp
Billy Costigan, Sr. (credit only)
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Kevin P. McCarthy
Detective #1 - Colin's Unit
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Chris Fischer
Detective #2 - Colin's Unit
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Joseph Riccobene
Kneecapped Bankrobber
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Johnny Cicco
Crack Addict
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Lyman Chen
Translator
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Shay Duffin
Bartender at Brasserie
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Emma Tillinger Koskoff
Woman with Dog
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Francesca Scorsese
Little Girl at Airport
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Dennis Lynch
Costello's Crew #1
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Michael Byron
Costello's Crew #2
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Eric Bruno Borgman
Reporter (uncredited)
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Brendan Burke
Irish Thug (uncredited)
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Jeffrey Corazzini
Crime Scene Unit (uncredited)
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Jim Ford
Cadet (uncredited)
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Lawrence Cameron Steele
Academy Firearms Instructor (uncredited)
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Kim Carrell
MA State Police Detective
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Robert Myers
Cadet Parent (uncredited)
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Rebecca Love
Adult Film Actress (uncredited)
