 | Woody Allen als Leonard Zelig |
 | Mia Farrow als Dr. Eudora Nesbitt Fletcher |
 | Patrick Horgan als The Narrator (voice) |
 | John Buckwalter als Dr. Sindell |
| Marvin Chatinover als Glandular Diagnosis Doctor |
| Stanley Swerdlow als Mexican Food Doctor |
| Paul Nevens als Dr. Birsky |
 | Howard Erskine als Hypodermic Doctor |
| Richard Whiting als Other Doctor |
| Ralph Bell als Other Doctor |
| Will Hussung als Other Doctor |
 | Gale Hansen als Freshman #1 |
 | Michael Jeter als Freshman #2 |
 | Peter McRobbie als Workers Rally Speaker |
 | Richard Litt als Charles Koslow |
 | Mary Louise Wilson als Sister Ruth |
| Alice Beardsley als Telephone Operator |
 | Paula Trueman als Woman on Telephone |
 | Garrett M. Brown als Actor Zelig |
 | Marianne Tatum als Actress Fletcher |
| Charles Denny als Actor Doctor |
| Michael Kell als Actor Koslow |
 | John Rothman als Paul Deghuee |
 | Deborah Rush als Lita Fox |
| Stanley Simmonds als Lita's Lawyer |
| Robert Berger als Zelig's Lawyer |
 | Jeanine Jackson als Helen Gray |
 | John Doumanian als Greek Waiter |
 | Willy Holt als Rally Chancellor |
 | Susan Sontag als Susan Sontag - Contemporary Interviews |
 | Saul Bellow als Saul Bellow - Contemporary Interviews |
 | Irving Howe als Irving Howe - Contemporary Interviews |
| Marshall Cole Sr. als Calvin Turner - Contemporary Interviews |
| Ellen Garrison als Older Dr. Fletcher - Contemporary Interviews |
| Jack Cannon als Mike Geibell - Contemporary Interviews |
| Theodore R. Smits als Ted Bierbauer - Contemporary Interviews |
| Sherman Loud als Older Paul Deghuee - Contemporary Interviews |
| Elizabeth Rothschild als Older Sister Meryl Fletcher - Contemporary Interviews |
| Kuno Sponholz als Oswald Pohl - Contemporary Interviews |
 | Ed Herlihy als Pathe News Announcer (voice) |
 | Dwight Weist als Hearst Metrotone Announcer (voice) |
| George Hamlin als Experimental Drugs Doctor |
| Robert Iglesia als Man in Barber Chair |
| Eli Resnick als Man in Park |
| Edward McPhillips als Scotsman |
| Sol Lomita als Martin Geist |
| Ed Lane als Man on Telephone |
| Sharon Ferrol-Young als Miss Baker |
| Dimitri Vassilopoulos als Martinez |
 | Stephanie Farrow als Sister Meryl |
| Francis Beggins als City Hall Speaker |
| Jean Trowbridge als Dr. Fletcher's Mother |
| Ken Chapin als On-Camera Interviewer |
| Gerald Klein als Hearst Guest |
 | Vincent Jerman-Jerosa als Hearst Guest |
| Erma Campbell als Zelig's Wife |
| Anton Marco als Wrist Victim |
| Louise Deitch als House-Painting Victim |
| Bernice Dowis als Vilification Woman |
| Bernie Herold als Carter Dean |
 | Elizabeth Kaitan als German Girl (uncredited) |
 | Arthur Anderson als Other Doctor (uncredited) |
 | Mae Questel als Voice of Helen Kane (uncredited) |
 | Bubba Dean Rambo als Charleston Dancer (uncredited) |
 | Kim Johnston Ulrich als Beauty Contestant (uncredited) |
 | William Haines als Self (archive footage) |
 | Dorothy Mackaill als Self (archive footage) |
 | Josephine Baker als Self (archive footage) (uncredited) |
| Michael Blevins als Lizard Dancer (uncredited) |
 | Fanny Brice als Self (archive footage) (uncredited) |
| Wilhelm Brückner als Self - Walking Behind Hitler (archive footage) (uncredited) |
 | James Cagney als Self (archive footage) (uncredited) |
 | Al Capone als Self (archive footage) (uncredited) |
 | Charlie Chaplin als Self (archive footage) (uncredited) |
 | Calvin Coolidge als Self - Pinning Medal (archive footage) (uncredited) |
 | Marion Davies als Self (archive footage) (uncredited) |
 | Dolores del Río als Self (archive footage) (uncredited) |
 | Sepp Dietrich als Self - with Hitler and Streicher (archive footage) (uncredited) |
 | Joe DiMaggio als Self - Playing Baseball (archive footage) (uncredited) |
 | Marie Dressler als Self (archive footage) (uncredited) |
 | F. Scott Fitzgerald als Self (archive footage) (uncredited) |
 | Lou Gehrig als Self (archive footage) (uncredited) |
 | Joseph Goebbels als Self (archive footage) (uncredited) |
 | Harold 'Red' Grange als Self (archive footage) (uncredited) |
 | Hermann Göring als Self (archive footage) (uncredited) |
 | Jon Hayden als Reporter (uncredited) |
| William Randolph Hearst als Self (archive footage) (uncredited) |
 | Rudolf Heß als Self (archive footage) (uncredited) |
 | Adolf Hitler als Self (archive footage) (uncredited) |
| Bobby Jones als Self (archive footage) (uncredited) |
 | Robert Ley als Self - with Goebbels (archive footage) (uncredited) |
 | Charles A. Lindbergh als Self (archive footage) (uncredited) |
 | Carole Lombard als Self (archive footage) (uncredited) |
 | Adolphe Menjou als Self (archive footage) (uncredited) |
 | Tom Mix als Self - At San Simeon (archive footage) (uncredited) |
| Franz Pfeffer von Salomon als Self with Hitler and Streicher (archive footage) (uncredited) |
| Mae Questel als Helen Kane (voice) (uncredited) |
 | Billy Rose als Self (archive footage) (uncredited) |
 | Babe Ruth als Self - Swinging Bat (archive footage) (uncredited) |
| Julius Schaub als Self - Walking Behind Hitler (archive footage) (uncredited) |
| Gregor Strasser als Self - With Back to Hitler (archive footage) (uncredited) |
 | Julius Streicher als Self - With Hitler and Hess (archive footage) (uncredited) |
| Franz von Epp als Self - With Goebbels and Ley (archive footage) (uncredited) |
| Jimmy Walker als Self - Mayor of New York (archive footage) (uncredited) |
| Ruth Leon Weiman als Mother of a Graduate (uncredited) |
| Tug Wilson als Police Officer (uncredited) |
 | Claire Windsor als Self (archive footage) (uncredited) |
| Gordon Willis | Director of Photography |
| Woody Allen | Director |
| Susan E. Morse | Editor |
| Charles H. Joffe | Executive Producer |
| Jack Rollins | Executive Producer |
| Dick Hyman | Original Music Composer |
| Robert Greenhut | Producer |
| Woody Allen | Writer |
| Michael Peyser | Associate Producer |
| Juliet Taylor | Casting |
| John Caglione Jr. | Makeup Artist |
| Speed Hopkins | Art Direction |
| Mel Bourne | Production Design |
| Michael Peyser | Production Manager |
| Santo Loquasto | Costume Design |
| Romaine Greene | Hair Designer |
| Werner Sherer | Hairstylist |
| Leslie Bloom | Set Decoration |
| Fern Buchner | Makeup Designer |
| Dan Sable | Supervising Sound Editor |
| John Edward Allen | Thanks |
| Ken Murray | Thanks |
| Kay Chapin | Script Supervisor |
| Irwin Young | Thanks |
| Pamela Scott Arnold | Assistant Editor |
| James Fanning | Transportation Captain |
| James Sabat | Production Sound Mixer |
| Stuart Robertson | Visual Effects Supervisor |
| Louis Sabat | Boom Operator |
| Rick Dior | Sound Re-Recording Mixer |
| Paula Herold | Casting Associate |
| Timothy M. Bourne | Location Manager |
| David J. Schweitzer | Special Effects |
| Kerry Hayes | Still Photographer |
| Patrick Hogan | Driver |
| Ray Quinlan | Gaffer |
| Gail Sicilia | Unit Publicist |
| Helen Robin | Production Coordinator |
| Dick Mingalone | Camera Operator |
| Ronald Burke | Grip |
| Richard Nord | Assistant Editor |
| Cosmo Sorice | Scenic Artist |
| Frank Graziadei | Sound Recordist |
| James Mazzola | Property Master |
| Frederic B. Blankfein | First Assistant Director |
| Tony Gittelson | Second Assistant Director |
| Ezra Swerdlow | Unit Manager |
| Duncan Scott | Additional Second Assistant Director |
| Jim Chory | Additional Second Assistant Director |
| Thomas A. Reilly | Assistant Director |
| Marjorie Deutsch | Sound Editor |
| Janet Rosenbloom | Set Decoration |
| Joseph Badalucco Jr. | Lead Set Dresser |
| James Sorice | Key Scenic Artist |
| Douglas C. Hart | Assistant Camera |
| Bob Paone | Second Assistant Camera |
| Roy B. Yokelson | Sound Engineer |
| Danny Daniels | Choreographer |
| Robert Ward | Key Grip |
| Arne Olsen | Construction Grip |
| Robert Connors | Best Boy Electric |
| Tom McKinley | Costume Assistant |
| Richard Hornung | Costume Assistant |
| Lyn Carroll | Costume Assistant |
| Bill Christians | Wardrobe Supervisor |
| Lancey Saunders Clough | Wardrobe Supervisor |
| Joan Lopate | Art Department Coordinator |
| Todd M. Thaler | Assistant Production Coordinator |
| Carl Turnquest | Projection |
| Cheryl Hill | Location Scout |
| Carol Nast | Location Scout |
| Susan Rollins | Location Scout |
| Ken Rothstein | Location Scout |
| Lynn Sable | Apprentice Sound Editor |
| Janet Lund Robbins | Apprentice Sound Editor |
| Randall Coleman | Assistant Sound Editor |
| Gina Roose | Assistant Sound Editor |
| Fred Rosenberg | Assistant Sound Editor |
| Harry Peck Bolles | Assistant Sound Editor |
| Jeffrey Stern | Assistant Sound Editor |
| Debra Bard | Assistant Sound Editor |
| Suzanne Pillsbury | Assistant Sound Editor |
