Casey Affleck as Lee Chandler

Lucas Hedges as Patrick Chandler

Michelle Williams as Randi Chandler

Kyle Chandler as Joe Chandler

C.J. Wilson as George

Gretchen Mol as Elise Henderson

Matthew Broderick as Jeffrey Garner

Anna Baryshnikov as Sandy

Heather Burns as Jill

Ivy O'Brien as Young Patrick Chandler

Kara Hayward as Silvie McGann

Tom Kemp as Stan Chandler

Josh Hamilton as Wes (Joe's Lawyer)

Tate Donovan as Hockey Coach

Ruibo Qian as Dr. Bethany

Robert Sella as Dr. Muller

Susan Pourfar as Nurse Irene

Stephen McKinley Henderson as Mr. Emery

Chloe Dixon as Suzy Chandler

Ellie Teves as Karen Chandler

Mary Mallen as Sharon

Richard Donelly as Mr. Martinez (1st Tenant)

Virginia Loring Cooke as Mrs. Groom (2nd Tenant)

Quincy Tyler Bernstine as Marianne (3rd Tenant)

Missy Yager as Mrs. Olsen (4th Tenant)

Ben Hanson as Bartender

Lewis D. Wheeler as 1st Businessman at Bar

Anthony Estrella as 2nd Businessman at Bar

Paul Meredith as Paul (Assistant Principal)

Carolyn Pickman as Paul's Assistant

Christian J. Mallen as CJ

Oscar Wahlberg as Joel

Wendy Overly as Wes's Assistant

Jackson Damon as Otto

Shawn Fitzgibbon as Tom Doherty (Ping-Pong Player)

Glenn McKiel as Manchester Police Chief

Joe Stapleton as Fire Marshall

Brian Chamberlain as Investigating Detective

Kenneth Lonergan as Manchester Pedestrian

Jami Tennille as Janine

Liam McNeill as Josh (Randi's Husband)

Danae Nason as Rachel (Randi's Friend)

Allyn Burrows as Father Martin

Nellie Lonergan as 1st Girl at School ("Godspell")

Brian A. White as Jerry (Guy in Boat Yard Office)

Erica McDermott as Sue (Angry Boss in Boat Yard Office)

Frank Garvin as Homeowner

William Bornkessel as George's Son (uncredited)

Kt Baldassaro as Bar Patron (uncredited)