Mark Ruffalo as Robert Bilott

Anne Hathaway as Sarah Bilott

Tim Robbins as Tom Terp

Bill Pullman as Harry Dietzler

Bill Camp as Wilbur Tennant

Victor Garber as Phil Donnelly

Mare Winningham as Darlene Kiger

William Jackson Harper as James Ross

Louisa Krause as Carla Pfeiffer

Kevin Crowley as Larry Winter

Bruce Cromer as Kim Burke

Denise Dal Vera as Sandra Tennant

Richard Hagerman as Joe Kiger

Abi Van Andel as Kathleen Welch

John Newberg as Dr. Gillespie

Barry Mulholland as Charles Holliday

Jeffrey Grover as Edward Wallace

Jim Azelvandre as Jim Tennant

Graham Caldwell as Teddy Bilott (3-5)

William 'Bucky' Bailey as Bucky Bailey

Marcia Dangerfield as Grammer

Brian Gallagher as David

Michael Haney as Managing Partner

Barry G. Bernson as Retired Partner

Michael King as Unpleasant Partner

Greg Violand as Union Carbide Lawyer

Michael Joseph Thomas Ward as DOW Lawyer

John Moll as Exxon Lawyer

Clara Harris as Receptionist

Bella Falcone as Crystal Tennant (11-13)

Scarlett Hicks as Amy Tennant

Amy Morse as Tom's Secretary

Aidan Brogan as Teddy Bilott (12-14)

Nathan Slaughter as Teddy Bilott (7-10)

Beau Hartwig as Tony Bilott (10-11)

Jacob Bukowski as Tony Bilott (4)

Keating P. Sharp as Charlie Bilott (11-12)

Mikel Furlow as Silas Pfeiffer (5)

Amy Warner as Sarah's Mother

Linnea Bond as Clerk

David Myers Gregory as Diner Owner

Shyra Thomas as Waitress

Ian Short as Doctor

Kyndra Jefferies as OB

Courtney DeCosky as All-American Mom

Ken Early as Chair of the Hearing

Kelly Mengelkoch as Dr. Mary-Sue Kimball

Annie Fitzpatrick as Judge

Buz Davis as Fire Captain

Ronald Jenkins as Security Guard

Wynn Reichert as Mediator

Mike Seely as Dr. Brooks

Teri Clark as Neurologist

Brian Robertson as Minister

Chaney Morrow as Young Farmer

Jon Osbeck as Sarah's Brother

Clyde Tyrone Harper as Judge #2

Lisa DeRoberts as Young Mother

Sara Mackie as Young Woman

Nathan Neorr as Local Reporter

Barbara Ann Crumm as Courtroom Deputy

Sheryl Annette Colley as Courtroom Employee

Logan Laskarzewski as Stenographer

Phil Fiorini as Pastor

Manuel Venegas Zepeda as Benihana Chef

Jennie Malone as Guitar Player / Singer

Jason M. Griggs as Allied Lawyer

George Zamary as Awbury Lawyer

Kurt Roberson as Mover

Todd Minobe as Cow Puppeteer #1

Jim Laprelle as Cow Puppeteer #2

Sydney Miles as Laura Doggett

Catch Farley as Scruffy Boy

Trent Rowland as Tall Boy

Geoff Falk as Worker #1

Glen Yrigoyen as Worker #2

Elizabeth Marvel as Dr. Karen Frank (voice)

Ming Wang as Waitress (uncredited)

Caleb Dwayne Tucker as Parkersburg Resident (uncredited)

Lea Hutton Beasmore as EPA / Dinner Guest (uncredited)

Anita Farmer Bergman as EPA Agent (uncredited)

Lyman Chen as Hack Scientist (uncredited)

Tyler Craig as (uncredited)

David Fultz as Blood Test Patient (uncredited)

Robert Gerding as Lawyer (uncredited)

John W. Harden as Waiter (uncredited)

Al Harland as Parkersburg Citizen (uncredited)

Dennis Craig Hensley as DuPont Lawyer (uncredited)

Daniel R. Hill as DuPont Security Guard (uncredited)

Marc Hockl as Church Goer (uncredited)

Sue Hopkins as Rob Bilott's Mother (uncredited)

Matt Hudson as Police Officer (uncredited)

Conner P. Kelley as Smoker (uncredited)

Angel Kerns as Parkersburg Resident (uncredited)

Bret Aaron Knower as EPA (uncredited)

Rodger Masten as Hand Double (uncredited)

David Pittinger as Taft Lawyer (uncredited)

Joanne Popolin as EPA Lawyer / Taft Lawyer (uncredited)

Ramona Schwalbach as Plantiff's Family (uncredited)

Carly Tamborski as EPA Hearing Attendee / Church Parishioner (uncredited)

Derek Polen as Taft Lawyer (uncredited)

John E. Brownlee as Taft Lawyer (uncredited)

Jenny McManus as Protester (uncredited)