Mark Wahlberg as Sgt. Tommy Saunders

John Goodman as Commisioner Ed Davis

J.K. Simmons as Sgt. Jeffrey Pugliese

Kevin Bacon as Richard DesLauriers

Michelle Monaghan as Carol Saunders

Alex Wolff as Dzhokhar Tsarnaev

Themo Melikidze as Tamerlan Tsarnaev

Michael Beach as Gov. Deval Patrick

Vincent Curatola as Mayor Thomas Menino

James Colby as Superintendent Billy Evans

Jake Picking as Sean Collier

Melissa Benoist as Katherine Russell

Jimmy O. Yang as Dun Meng

Chris O'Shea as Patrick Downes

Rachel Brosnahan as Jessica Kensky

Khandi Alexander as Veronica

Lana Condor as Li

Dustin Tucker as Steve Woolfenden

Lucas Thor Kelley as Leo Woolfenden

Martine Assaf as Connie Pugliese

Cara Leroy O'Connell as Kara

Pamela Amicy as Tiesha

Brandon Wahlberg as Officer Travis Dixon

Kelby Turner Akin as Officer Dic Donohue

Billy Smith as Charlie Collins

Paige MacLean as Lisa Murphy

Adam Trese as John Bradshaw

Hampton Fluker as James Williams

Jay Giannone as Jimmy

Cliff Moylan as Sergeant John MacLellan

Curtis J. Bellafiore as Officer Joey Reynolds

Elijah Guo as Dias Kadyrbayev

Jin Yang Brancalhao as Aza

Brent Saunders as Robel

Dean Neistat as Michael Butler

John Fiore as Michael Thomas

Kathy Harum as Carol's Mom

Erica McDermott as Jimmy's Girlfriend

Peter Berg as Guy Opening MIT Door

John Franchi as Park Pedestrian

Arthur Wahlberg as Uncle Archie

Anthony "Ace" Thomas as Third Officer at Falcon

David Ortiz as David Ortiz

Jay Karales as Marathon Attendee (uncredited)

Anthony Molinari as Waterville Policeman (uncredited)

Katrine Hoyt as Surgical Nurse #2 (uncredited)

Dicky Eklund Jr. as Young Police Officer

Kevin Molis as Watertown Police Officer

Colleen Kelly as FBI Analyst #4 (uncredited)

Token as Dzhokhar's Roommate

Sean Avery as Watertown Officer Franklin Street

Linda Klein as Tamerlan's Surgeon

Alexandria Tait as College Girl Outside of Sean Collier's #1 (uncredited)