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 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)