Jefferson Smith
James Stewart
Clarissa Saunders
Jean Arthur
Susan Paine
Astrid Allwyn
Senate Reporter (uncredited)
Eddie Fetherston
Mabel Forrest
Committeewoman (uncredited)
Gladys Gale
Reporter (uncredited)
Jack Gardner
Woman (uncredited)
Mary Gordon
Woman at Station (uncredited)
June Gittelson
Lorna Gray
First Radio Announcer (uncredited)
Harry Hayden
Soapbox Speaker (uncredited)
Louis Jean Heydt
Senator Fernwick (uncredited)
John Ince
Emma Hopper
Ruth Donnelly
Senator Byron (uncredited)
Frank Jaquet
Senator Albert (uncredited)
Philo McCullough
Senator Carlton (uncredited)
Wright Kramer
Senator (uncredited)
Henry Hebert
Fred Hoose
Richard Kipling
Senate Guard (uncredited)
Roger Haliday
House Boy (uncredited)
Wilfred Hari
Boy Ranger (uncredited)
Philip Hurlic
Butler (uncredited)
Olaf Hytten
Senator MacPherson
Grant Mitchell
Committeeman (uncredited)
Lloyd Ingraham
(uncredited)
Mitchell Ingraham
Hoodlum (uncredited)
Dick Jensen
John Lester Johnson
Eddie Kane
Donald Kerr
Milton Kibbee
Summers (uncredited)
Joe King
Evalyn Knapp
Bodyguard (uncredited)
Paul Kruger
Senator Monroe
Porter Hall
Bobby Larson
Billy Lechner
Jackie Lowe
Rabbi (uncredited)
P.H. Levy
Mrs. Edwards (uncredited)
Vera Lewis
Chorus Member (uncredited)
Jack Lindquist
George Lloyd
Chief Clerk (uncredited)
Arthur Loft
Jack Low
Photographer (uncredited)
Jimmie Lucas
Senator Barnes
Pierre Watkin
Head Sister (uncredited)
Mary MacLaren
Hank Mann
Nun (uncredited)
Margaret Mann
Man in Senate Building (uncredited)
Eric Mayne
Assistant Bartender (uncredited)
Ralph McCullough
George McKay
Veteran at Lincoln Memorial (uncredited)
Lafe McKee
Pompous Man (uncredited)
Ben Taggart
Field Norton
Wilfred Lucas
Nosey
Charles Lane
Sammy McKim
James McNamara
William Newell
Radio Announcer #2 (uncredited)
Robert Middlemass
James Millican
Shoe Salesman (uncredited)
Howard M. Mitchell
Porter (uncredited)
Charles R. Moore
Gene Morgan
Senate Clerk (uncredited)
Robert Morgan
Ray Nichols
Bill Griffith
William Demarest
Foreign Diplomat (uncredited)
Alex Novinsky
Senator Alfred (uncredited)
Frank O'Connor
Fisk (uncredited)
Frank Otto
Joe Palma
Spencer Quinn
Tom Quinn
Ed Randolph
Charles Regan
Lang (uncredited)
Jack Rice
Senator Ashman (uncredited)
Wyndham Standing
Carl Cook
Dick Elliott
Senator Carlisle (uncredited)
Ferris Taylor
Senator Manchester (uncredited)
Jack Richardson
Senator Pickett (uncredited)
Walter Soderling
Senator Atwater (uncredited)
Harry Stafford
Senator Grainger (uncredited)
Victor Travis
Senator Burdette (uncredited)
Carl Stockdale
Senator Holland (uncredited)
Bob Walker
Henry Roquemore
Craig Stevens
Flood a Newsman (uncredited)
Paul Stanton
Peter Hopper
Billy Watson
Otis Hopper (uncredited)
Johnny Russell
Newspaperman with Pipe (uncredited)
Walter Sande
Hendricks (uncredited)
Frank M. Thomas
Harry Strang
Harry Tenbrook
Dave Willock
Schultz (uncredited)
Lloyd Whitlock
John Tyrrell
Paine's Friend (uncredited)
Frederick Vroom
Cab Driver (uncredited)
Charles Sullivan
Jimmie Hopper
Delmar Watson
Doorman (uncredited)
Arthur Thalasso
Edward Thomas
Mrs. Taylor (uncredited)
Laura Treadwell
Layne Tom Jr.
Jane Hopper (uncredited)
Myonne Walsh
Billy Wayne
Max Waizmann
John Ward
Jane Loofbourrow
Blanche Payson
Joseph Paine
Claude Rains
Hopper Boy
John Russell
Emma Tansey
Bess Wade
Florence Wix
Eleanor Wood
Black Committeeman (uncredited)
Jesse Graves
Angry Committee Member (uncredited)
Gus Glassmire
Larry Steers
Landers Stevens
William Worthington
Edward Biby
Harry Watson
Count Stefenelli
David Wade
Frank McLure
Garry Watson
Larry Simms
Radio Broadcaster
H.V. Kaltenborn
Kenneth Allen (uncredited)
Russell Simpson
Hopper Girl (uncredited)
Frances Gifford
Narrator (uncredited)
Colin James Mackey
Hopper's Butler (uncredited)
Wilson Benge
Richard Jones (uncredited)
Dickie Jones
Jim Taylor
Edward Arnold
Handwriting Expert (uncredited)
Erville Alderson
Frank Puglia
Maurice Cass
Senator Hodges (uncredited)
Stanley Andrews
Senator Dwight (uncredited)
Al Bridge
Edwin August
Senator Gower (uncredited)
Edmund Cobb
Senator Lancaster (uncredited)
Sam Ash
Senator Hammett (uncredited)
Harry A. Bailey
Stanley Mack
Governor Hopper
Guy Kibbee
Brooks Benedict
Family Man (uncredited)
Wade Boteler
Dorothy Comingore
Chester Conklin
Barber (uncredited)
Gino Corrado
Paine's Secretary (uncredited)
Ann Doran
Editor (uncredited)
Robert Emmett Keane
Matt McHugh
Kathryn Bates
Inventor (uncredited)
Frank Austin
Diz Moore
Thomas Mitchell
William Arnold
Tommy Baker
Robert Sterling
Dub Taylor
George Chandler
Fred 'Snowflake' Toones
Sweeney Farrell (uncredited)
Jack Carson
Cheering Boy (uncredited)
Tommy Bupp
Mrs. McGann (uncredited)
Dora Clement
Bert Moorhouse
Chick McGann
Eugene Pallette
Arthur Kim (uncredited)
Harry C. Bradley
Lynton Brent
Ed Brewer
Mr. Edwards (uncredited)
Harlan Briggs
Harry Burkhardt
Senator Dearhorn (uncredited)
Frederick Burton
Third Radio Speaker (uncredited)
Georgia Caine
Announcer (uncredited)
Ken Carpenter
Townsend (uncredited)
Burr Caruth
Ragner (uncredited)
Allan Cavan
Ma Smith
Beulah Bondi
Eddy Chandler
Davison Clark
Richard Clucas
Shirley Coates
Eddie Coke
Hal Cooke
Speaker (uncredited)
Alec Craig
Anne Cornwall
Waiter (uncredited)
George Cooper
Georgie Cooper
Senate Majority Leader
H.B. Warner
Jack Cooper
Nick Copeland
Vernon Dent
Diggs (uncredited)
Maurice Costello
Beatrice Curtis
Lew Davis
Dulcie Day
Wally Dean
Hat Salesman / Secretary (uncredited)
Harry Depp
Hopper's Secretary (uncredited)
Byron Foulger
President of the Senate
Harry Carey
Helen Jerome Eddy
Francis Scott Key (uncredited)
Douglas Evans
Joe Devlin
Clyde Dilson
Secretary (uncredited)
John Dilson
Senate Chaplain (uncredited)
Neal Dodd
Taylor's Stooge (uncredited)
Lester Dorr
Robert Dudley
Edward Earle
Jack Egan
Story
Lewis R. Foster
Original Music Composer
Dimitri Tiomkin
Music Director
Morris Stoloff
Director
Frank Capra
Visual Effects
Slavko Vorkapich
Screenplay
Sidney Buchman
Editor
Gene Havlick
Director of Photography
Joseph Walker
Art Direction
Lionel Banks
Al Clark
Costume Design
Robert Kalloch
Assistant Director
Arthur S. Black Jr.