Matt Damon as Rory

Casey Affleck as Cobby

Ving Rhames as Frank Toomey

Jack Harlow as Scalvo

Michael Stuhlbarg as Mr. Besegai

Alfred Molina as Richie Dechico

Owen Earls as Charlie Haggerty

Hong Chau as Dr. Donna Rivera

Natalie Carter as Mrs. Haggerty

Walter Liebman as Terry

André De Shields as Mr. Kelly

Ron Perlman as Mayor Miccelli

Rob Gronkowski as Rob Gronkowski

Toby Jones as Attorney Alan Flynn

Slate Holmgren as Dave Wedge

Ronnie Cho as Mark Choi

Sheika Murray as Waiter #1 at Wharf

Perry Strong as Waiter #2 at Wharf

Nick Trice as City Hall Employee

Tommy Nohilly as Police Commissioner

Jason Furlani as Cabinet Member

David Gborie as Bouncer

Toby Onwumere as John Wayne

Paul Walter Hauser as Booch

Scout Backus as Colani

Nicholas B Alexander as Sergeant at Rivera's Office

Nathaniel Wood as Massachusetts Trooper #1

Craig Hutchinson as Massachusetts Trooper #2

Mike Bash as Boston Police Officer

Deirdre McCourt as Vermont Cop

Shawn Fitzgibbon as Quincy Cop

Jerry Kernion as Fire Monitor

Nik Walker as Hero Fireman

Ramona Floyd as Bartender

Mark Steven Dancewicz as Tactical Cop

Brett Keating as Sniper in Tower

Michael Rodrick as Police on the Roof

Eleni Yiovas as Senior Tactical Cop

Gregory Cunningham as Senior Cop at Plaza

Peter Morse as Cop at Barricade

Robert Marsella as Cop That Says Hey

Don DiPetta as Officer at Airport

Christopher Brian Roach as Police Transfer Officer

Billy Smith as New Police Commissioner

John Noble Barrack as Photographer

Jadon Cole as Rory's Son

Robbie Dema as Border Patrol Mountie #1

Robert Harvey as Border Patrol Mountie #2

Jonathan Gabriel Charles as Pollster