Matt Damon Producer
John Krasinski Executive Producer
Michelle Williams Randi Chandler
Kyle Chandler Joe Chandler
Matthew Broderick Jeffrey Garner
Casey Affleck Lee Chandler
Erica McDermott Sue (Angry Boss in Boat Yard Office)
William Bornkessel George's Son (uncredited)
Tate Donovan Hockey Coach
Gretchen Mol Elise Henderson
Heather Burns Jill
Missy Yager Mrs. Olsen (4th Tenant)
Summer Phoenix Thanks
Stephen McKinley Henderson Mr. Emery
Ivy O'Brien Young Patrick Chandler
Melissa Toth Costume Design
Brian Chamberlain Investigating Detective
Alex Berard Location Manager
Liam McNeill Josh (Randi's Husband)
Kara Hayward Silvie McGann
Josh Hamilton Wes (Joe's Lawyer)
Lucas Hedges Patrick Chandler
Tom Kemp Stan Chandler
Matt Bouldry Casting Associate
Hannah Rhein Set Costumer
Mary Mallen Sharon
C.J. Wilson George
Chris Moore Producer
Anna Baryshnikov Sandy
Ben Hanson Bartender
Oscar Wahlberg Joel
Susan Pourfar Nurse Irene
Dann Fink ADR Voice Casting
Alexa Zimmerman Dialogue Editor
Kt Baldassaro Bar Patron (uncredited)
Jody Lee Lipes Director of Photography
Roland Vajs Sound Re-Recording Mixer, Foley Editor
Brant S. Fagan Steadicam Operator
Kevin S. Parker Sound Mixer
Kenneth Lonergan Manchester Pedestrian, Director, Writer
Ryan Baker Utility Sound
Joe Stapleton Fire Marshall
Christian Mallen CJ
Danae Nason Rachel (Randi's Friend)
Declan Baldwin Executive Producer, Unit Production Manager
Rob Fitz Makeup Artist
Ruibo Qian Dr. Bethany
Quincy Tyler Bernstine Marianne (3rd Tenant)
Dan Edelstein ADR Editor
David Blazina Second Assistant Director
Patrick M. Walsh Stunt Coordinator
Allyn Burrows Father Martin
Teresa Hays Best Boy Grip
Cynthia Garcia Walker Production Accountant
Jacob Ribicoff Sound Re-Recording Mixer, Sound Designer, Supervising Sound Editor
Jackson Damon Otto
Joanna Murphy Assistant Costume Designer
Brian Ricci Special Effects
Douglas Aibel Casting
James Shearman Orchestrator
Paul Marini Stunt Coordinator
Morgan Kling Property Master
Jourdan Henderson Art Direction
Lewis D. Wheeler 1st Businessman at Bar
Gigi Pritzker Producer
Kevin J. Walsh Producer
Matthew Nutter Graphic Designer
Tyler Newhouse ADR Recordist
Jennifer Lame Editor
Ryan Collison Foley Recording Engineer
Shawn Fitzgibbon Tom Doherty (Ping-Pong Player)
Beth Anderson Assistant Property Master