Sean Connery as Paul Bradley

Natalie Wood as Tatiana Donskaya

Karl Malden as Harry Sherwood

Brian Keith as Dr. Dubov

Martin Landau as General Adlon

Trevor Howard as Sir Michael Hughes

Richard Dysart as Secretary of Defense

Henry Fonda as The President

Joseph Campanella as General Easton

Bo Brundin as Rolf Manheim

Katherine De Hetre as Jan Watkins

James G. Richardson as Alan Marshall

Roger Robinson as Bill Hunter

Michael Zaslow as Sam Mason

John Findlater as Astronaut Tom Easton

Paul Tulley as Astronaut Bill Frager

Allen Williams as Astronaut Michael McKendrick

Bibi Besch as Helen Bradley

Gregory Gaye as Russian Premier

Clyde Kusatsu as Yamashiro

Burke Byrnes as Coast Guard Officer

Joe Medalis as Bartender

Charles Bartlett as Guard

Raymond O'Keefe as Guard

Henry Olek as Army Translator

Peter Bourne as U.N. President

Stanley Mann as Canadian Representative

Ronald Neame as British Representative

Philip Sterling as Russian Representative

Arthur Adams as Ghana Representative

Fred Carney as United States Representative

Sybil Danning as Girl Skier

Meschino Paterlini as Boy Skier

Joe Yune as Siberian Man

Eileen Saki as Siberian Woman

Christine Anne Baur as Communications Center Technician

Paul Camen as Communications Center Technician

Dorothy Catching as Communications Center Technician

Bill Couch as Communications Center Technician

William Darr as Communications Center Technician

Joan Foley as Communications Center Technician

Paul Laurence as Communications Center Technician

John Moio as Communications Center Technician

Read Morgan as Communications Center Technician

Conrad E. Palmisano as Communications Center Technician

Tony Rocco as Communications Center Technician

Jesse Wayne as Communications Center Technician

Carole Hemingway as Sherwood's Secretary

Clete Roberts as Network Newscaster

Stu Nahan as Football Announcer

Osman Ragheb as Swiss TV Newscaster

Yu Wing as Chinese Fisherman

Yau Tsui Ling as Chinese Fisherman's Wife

Ricker Slaven as Canteen Worker

James Bacon as News Reporter

Yani Begakis as News Reporter

Selma Archerd as Woman in Subway

Domingo Ambriz as Boy with Radio

Peter Donat as Opening Sequence Narrator (voice)

Simon Cadell as British News Reporter (uncredited)

John McKinney as Peter Watson