| Person | Type | Job | Role(s) |
|---|---|---|---|
 Alexander Courage | Crew | Sound | Music, Orchestrator |
 Arthur P. Jacobs | Crew | Production | Producer |
 Dean Vernon | Crew | Sound | Sound |
 Don Taylor | Crew | Directing | Director |
Frank Capra, Jr. | Crew | Production | Associate Producer |
Howard A. Anderson III | Crew | Crew | Special Effects Coordinator |
Jack Martin Smith | Crew | Art | Art Direction |
 Jerry Goldsmith | Crew | Sound | Original Music Composer |
 Joseph F. Biroc | Crew | Camera | Director of Photography |
Marion Rothman | Crew | Editing | Editor |
 Paul Dehn | Crew | Writing | Screenplay |
 Pierre Boulle | Crew | Writing | Characters |
Stuart A. Reiss | Crew | Art | Art Direction |
Theodore Soderberg | Crew | Sound | Sound |
Walter M. Scott | Crew | Art | Art Direction |
William J. Creber | Crew | Art | Art Direction |
 Alan Baxter | Cast | Actor | General (uncredited) |
 Albert Salmi | Cast | Actor | E-1 |
Army Archerd | Cast | Actor | Referee |
 Arthur Tovey | Cast | Actor | Official at Briefing (uncredited) |
 Bradford Dillman | Cast | Actor | Dr. Lewis Dixon |
 Donald Elson | Cast | Actor | Curator |
 Elizabeth Harrower | Cast | Actress | Reporter at Hotel (uncredited) |
 Eric Braeden | Cast | Actor | Dr. Otto Hasslein |
 Hank Robinson | Cast | Actor | Reporter (uncredited) |
 Harry Lauter | Cast | Actor | General Winthrop |
 James Bacon | Cast | Actor | General Faulkner |
James Gonzalez | Cast | Actor | Official at Briefing (uncredited) |
 James B. Sikking | Cast | Actor | Control Room Officer (uncredited) |
James W. Gavin | Cast | Actor | Helicopter Pilot (uncredited) |
 Jason Evers | Cast | Actor | E-2 |
Joe Gray | Cast | Bodyguard (uncredited) | |
 John Alderman | Cast | Actor | Marine Corporal (uncredited) |
 John Randolph | Cast | Actor | Committee Chairman |
 Kim Hunter | Cast | Actress | Dr. Zira |
 Linda Harrison | Cast | Actress | Nova (archive footage) (uncredited) |
 M. Emmet Walsh | Cast | Actor | Aide |
 Natalie Trundy | Cast | Actress | Dr. Stephanie 'Stevie' Branton |
 Norman Burton | Cast | Actor | Army Officer |
 Peter Forster | Cast | Actor | Cardinal |
 Ricardo Montalban | Cast | Actor | Armando |
 Robert Nichols | Cast | Actor | Reporter (uncredited) |
Janos Prohaska | Cast | Actor | Heloise (uncredited) |
 Roddy McDowall | Cast | Actor | Cornelius |
 Roy Glenn | Cast | Actor | Lawyer (as Roy E. Glenn Sr.) |
 Sal Mineo | Cast | Actor | Dr. Milo |
 Sam Chew Jr. | Cast | Actor | Undetermined (uncredited) |
 Shep Houghton | Cast | Actor | Bystander (uncredited) |
Sig Frohlich | Cast | Actor | Spectator (uncredited) |
Stephen Roberts | Cast | Actor | Gen. Brody (uncredited) |
 Tom Lowell | Cast | Actor | Orderly |
 Walker Edmiston | Cast | Actor | Talking Baby Chimp (uncredited) (voice) |
 William Beckley | Cast | Actor | British News Anchor (uncredited) |
 William Tregoe | Cast | Actor | Hotel Receptionist (uncredited) |
 William Windom | Cast | Actor | The President |
Ron Pinkard | Cast | Actor | Undetermined (uncredited) |
 William Woodson | Cast | Actor | Naval Officer |
 Paul Bradley | Cast | Actor | Official at Briefing (uncredited) |
Tony Regan | Cast | Actor | Reporter at Hotel (uncredited) |
George Golden | Cast | Official at Briefing (uncredited) | |
Jack Slate | Cast | Reporter (uncredited) | |
Joseph La Cava | Cast | Actor | Waiter (uncredited) |
Gene Whittington | Cast | Actor | Marine Captain |
 Jack Berle | Cast | Actor | Secretary of State (uncredited) |
Bill Bonds | Cast | TV Newscaster | |
Karl Bruck | Cast | German Newscaster (uncredited) | |
 Bob Harks | Cast | Actor | Aide (uncredited) |
Robert Cole | Cast | Actor | Reporter (uncredited) |
| Person | Type | Job | Role(s) |
