Woody Allen as Leonard Zelig

Mia Farrow as Dr. Eudora Nesbitt Fletcher

Patrick Horgan as The Narrator (voice)

John Buckwalter as Dr. Sindell

Marvin Chatinover as Glandular Diagnosis Doctor

Stanley Swerdlow as Mexican Food Doctor

Paul Nevens as Dr. Birsky

Howard Erskine as Hypodermic Doctor

Richard Whiting as Other Doctor

Ralph Bell as Other Doctor

Will Hussung as Other Doctor

Gale Hansen as Freshman #1

Michael Jeter as Freshman #2

Peter McRobbie as Workers Rally Speaker

Richard Litt as Charles Koslow

Mary Louise Wilson as Sister Ruth

Alice Beardsley as Telephone Operator

Paula Trueman as Woman on Telephone

Garrett M. Brown as Actor Zelig

Marianne Tatum as Actress Fletcher

Charles Denny as Actor Doctor

Michael Kell as Actor Koslow

John Rothman as Paul Deghuee

Deborah Rush as Lita Fox

Stanley Simmonds as Lita's Lawyer

Robert Berger as Zelig's Lawyer

Jeanine Jackson as Helen Gray

John Doumanian as Greek Waiter

Willy Holt as Rally Chancellor

Susan Sontag as Susan Sontag - Contemporary Interviews

Saul Bellow as Saul Bellow - Contemporary Interviews

Irving Howe as Irving Howe - Contemporary Interviews

Marshall Cole Sr. as Calvin Turner - Contemporary Interviews

Ellen Garrison as Older Dr. Fletcher - Contemporary Interviews

Jack Cannon as Mike Geibell - Contemporary Interviews

Theodore R. Smits as Ted Bierbauer - Contemporary Interviews

Sherman Loud as Older Paul Deghuee - Contemporary Interviews

Elizabeth Rothschild as Older Sister Meryl Fletcher - Contemporary Interviews

Kuno Sponholz as Oswald Pohl - Contemporary Interviews

Ed Herlihy as Pathe News Announcer (voice)

Dwight Weist as Hearst Metrotone Announcer (voice)

George Hamlin as Experimental Drugs Doctor

Robert Iglesia as Man in Barber Chair

Eli Resnick as Man in Park

Edward McPhillips as Scotsman

Sol Lomita as Martin Geist

Ed Lane as Man on Telephone

Sharon Ferrol-Young as Miss Baker

Dimitri Vassilopoulos as Martinez

Stephanie Farrow as Sister Meryl

Francis Beggins as City Hall Speaker

Jean Trowbridge as Dr. Fletcher's Mother

Ken Chapin as On-Camera Interviewer

Gerald Klein as Hearst Guest

Vincent Jerman-Jerosa as Hearst Guest

Erma Campbell as Zelig's Wife

Anton Marco as Wrist Victim

Louise Deitch as House-Painting Victim

Bernice Dowis as Vilification Woman

Bernie Herold as Carter Dean

Elizabeth Kaitan as German Girl (uncredited)

Arthur Anderson as Other Doctor (uncredited)

Bubba Dean Rambo as Charleston Dancer (uncredited)

Kim Johnston Ulrich as Beauty Contestant (uncredited)

Michael Blevins as Lizard Dancer (uncredited)

Jon Hayden as Reporter (uncredited)

Mae Questel as Helen Kane (voice) (uncredited)

Ruth Leon Weiman as Mother of a Graduate (uncredited)

Tug Wilson as Police Officer (uncredited)