Mark Wahlberg
Sgt. Tommy Saunders

John Goodman
Commisioner Ed Davis

J.K. Simmons
Sgt. Jeffrey Pugliese

Kevin Bacon
Richard DesLauriers

Michelle Monaghan
Carol Saunders

Alex Wolff
Dzhokhar Tsarnaev

Themo Melikidze
Tamerlan Tsarnaev

Michael Beach
Gov. Deval Patrick

Vincent Curatola
Mayor Thomas Menino

James Colby
Superintendent Billy Evans

Jake Picking
Sean Collier

Melissa Benoist
Katherine Russell

Jimmy O. Yang
Dun Meng

Chris O'Shea
Patrick Downes

Rachel Brosnahan
Jessica Kensky

Khandi Alexander
Veronica

Lana Condor
Li

Dustin Tucker
Steve Woolfenden

Martine Assaf
Connie Pugliese

Billy Smith
Charlie Collins

Paige MacLean
Lisa Murphy

Adam Trese
John Bradshaw

Hampton Fluker
James Williams

Jay Giannone
Jimmy

Cliff Moylan
Sergeant John MacLellan

Elijah Guo
Dias Kadyrbayev

Dean Neistat
Michael Butler

John Fiore
Michael Thomas

Kathy Harum
Carol's Mom

Erica McDermott
Jimmy's Girlfriend

Peter Berg
Guy Opening MIT Door

John Franchi
Park Pedestrian

Arthur Wahlberg
Uncle Archie

Anthony "Ace" Thomas
Third Officer at Falcon

David Ortiz
David Ortiz

Jay Karales
Marathon Attendee (uncredited)

Anthony Molinari
Waterville Policeman (uncredited)

Katrine Hoyt
Surgical Nurse #2 (uncredited)

Dicky Eklund Jr.
Young Police Officer

Colleen Kelly
FBI Analyst #4 (uncredited)

Token
Dzhokhar's Roommate

Sean Avery
Watertown Officer Franklin Street

Linda Klein
Tamerlan's Surgeon