- Brian Donlevy
- Major General Leslie R. Groves
- Robert Walker
- Colonel Jeff Nixon
- Tom Drake
- Matt Cochran
- Beverly Tyler
- Anne Cochran
- Audrey Totter
- Jean O'Leary
- Hume Cronyn
- Dr. J. Robert Oppenheimer
- Hurd Hatfield
- Dr. John Wyatt
- Joseph Calleia
- Dr. Enrico Fermi
- Godfrey Tearle
- President Franklin D. Roosevelt
- Victor Francen
- Dr. Marré
- Richard Haydn
- Dr. Chisholm
- Jonathan Hale
- Dr. Vannevar Bush
- John Litel
- K. T. Keller
- Henry O'Neill
- General Thomas F. Farrell
- Warner Anderson
- Captain William S. Parsons, U.S.N.
- Barry Nelson
- Colonel Paul Tibbetts Jr.
- Art Baker
- President Harry S. Truman
- Ludwig Stössel
- Dr. Albert Einstein
- John Hamilton
- Dr. Harold C. Urey
- Frank Ferguson
- Dr. James B. Conant
- Tom Stevenson
- Dr. E. P. Wigner
- John Gallaudet
- Dr. Leo Szilard
- Nella Walker
- Grace Tully
- Edward Earle
- Charles G. Ross
- Moroni Olsen
- Dr. Arthur H. Compton
- Norman Lloyd
- Dr. Troyanski
- Jim Davis
- Pilot at Tinian
- Charles Trowbridge
- Walter S. Carpenter Jr.
- Frank Wilcox
- Dr. W. H. Zinn
- Henry Hall
- General Brehon Somervell
- Paul Harvey
- Lieut. General W.D. Styer
- Larry Johns
- Quaker Scientist
- Robert Emmett Keane
- Dr. Rand
- James Bush
- Dr. Ernest O. Lawrence
- Trevor Bardette
- Clinic Doctor
- William Wright
- Colonel John Lansdale
- Damian O'Flynn
- C. D. Howe
- Richard Abbott
- Danish Underground Leader
- Philip Ahlm
- Armed Guard
- John Albright
- Quaker Scientist
- Erville Alderson
- Secretary of War Henry Stimson
- Kirk Alyn
- Scientist
- Rod Bacon
- Crew Member
- Frank Baker
- Canadian Officer
- Walter Baldwin
- Workman
- John Banner
- German Laboratory Assistant
- Gregg Barton
- Enola Gay Navigator
- Holger Bendixen
- German Submarine Commander
- Lee Bennett
- Sergeant
- Joseph E. Bernard
- Townsman
- Margaret Bert
- Townswoman
- Robert Bice
- Co-Pilot
- William Bishop
- 2nd Lieutenant - Electronics Officer, Enola Gay
- Carlyle Blackwell Jr.
- Armed Guard
- Larry J. Blake
- Tough Military Policeman
- Stanley Blystone
- Civilian Guard
- John Bogden
- Scientist
- Charles Bradstreet
- Airport Guard
- Tex Brodus
- Enola Gay Ground Crewman
- Paul Bryar
- Army Officer
- Tom Burton
- Officer
- Roy Butler
- Townsman
- George M. Carleton
- Senator
- James Carlisle
- Industrialist
- Douglas Carter
- Quaker Scientist
- Ed Cassidy
- Rafferty
- Frank Chalfant
- Scientist
- Spencer Chan
- Japanese Naval Officer
- Peter Chong
- Japanese General
- Bron Clifford
- Chaplain
- Bruce Cowling
- Enola Gay Ground Crewman
- Ralph Crane
- Weatherman
- Frank Dae
- Senator
- Bert Davidson
- Armed Guard
- Boyd Davis
- Senator
- Harry Denny
- Passing Officer
- Tom Dillon
- Gregor
- Ralph Dunn
- Guard
- Dick Earle
- Industrialist
- Helen Eby-Rock
- Townswoman
- Blake Edwards
- CIC Man
- Frank Erickson
- Attendant
- Herbert Evans
- Scientist
- Lloyd Everett
- Enola Gay Ground Crewman
- Budd Fine
- Evictee
- William Forrest
- Brigadier General
- Ted French
- Townsman
- Arno Frey
- Nazi Official
- Paul Fung
- Japanese Radar Officer
- Jack Gallagher
- Evictee
- John Gannon
- Orderly
- Stewart Garner
- Communications Officer
- Kenneth Gibson
- President Truman's Secretary
- Tom Gibson
- Minor Role
- Frederick Giermann
- Nazi Officer
- Bob Gilbert
- Lieutenant - R.C.M., Enola Gay
- Jon Gilbreath
- Attendant
- William Graeff Jr.
- Emergency Switch Operator
- Clarke Hardwicke
- Enola Gay Co-Pilot
- Sam Harris
- Scientist on Plane
- Harry Hayden
- Harried Editor
- Bill Hickman
- Barometric Observer
- Russell Hicks
- General
- Earle Hodgins
- Gate Guard
- Jimmie Horan
- Soldier at Airfield
- James Horne Jr.
- Barmetric Observer
- Anne Howard
- English Laboratory Assistant
- Jimmy Hunt
- Little Boy
- Selmer Jackson
- Senior Engineer
- John James
- Engineer
- William Janssen
- Instrument Operator
- Bobby Jordan
- Radioman on Tinian Receiving A-Bomb Message
- Tommy Kelly
- Mack
- John B. Kennedy
- Self - Newsreel Narrator
- Mike Killian
- Senior Engineer
- Martin Kosleck
- Dr. O. E. Frisch
- Paul Kruger
- Construction Engineer
- Al Kunde
- Evictee
- Peter Lawford
- Member of Military Personnel
- Nolan Leary
- Townsman
- Jack Lee
- Gen. Groves' Aide
- William F. Leicester
- Enola Gay Flight Engineer
- Frank Leigh
- British General
- James B. Leong
- Japanese Army Officer
- Weaver Levy
- Japanese Sailor
- Donald S. Lewis
- Secret Service Man
- King Lockwood
- Colonel Nichols
- Richard Loo
- Japanese Officer
- Robert Malcolm
- Keith
- Jack Manolas
- Minor Role
- Chris-Pin Martin
- Mexican Man
- Louis Mason
- Workman
- Roger McGee
- Scientist
- Michael McGrath
- Dr. Kistiakonsky
- Malcolm 'Bud' McTaggart
- Radio Operator
- Patricia Medina
- Mrs. Wyatt
- Danny Merrill
- Scientist
- Sybil Merritt
- Cute Guide
- Torben Meyer
- Milkman
- Howard M. Mitchell
- Townsman
- Forbes Murray
- Briefing Officer
- Merlyn Nelson
- Evictee
- James Nolan
- President Roosevelt's Bodyguard
- Wedgwood Nowell
- Industrialist
- Larry Nunn
- Worried GI
- Fred Nurney
- Nazi Officer
- Ray Page
- Meter Man
- Eddie Parks
- Bewildered Civilian
- Charles Peck
- GI Messenger
- Ray Pemberton
- Electronics Engineer
- Bob Pepper
- Crewman
- George Peters
- Nurse
- Tom Pilkington
- Man with Counter
- Otto Reichow
- Nazi Officer
- William Roberts
- Enola Gay Radio Operator
- Ellen Ross
- Waitress
- Carl Saxe
- German General's Aide
- Frank J. Scannell
- Winne
- Jerry Schumacher
- Nazi Officer
- Hans Schumm
- Nazi Police Officer
- Dorothy Scott
- Laboratory Assistant
- Robin Short
- Young Scientist
- Leslie Sketchley
- Soldier
- Buster Slaven
- Enola Gay Assistant Gunner
- J. Lewis Smith
- Wolfish Soldier
- Eunice Soo-Hoo
- Japanese Child
- Robert Spencer
- Nuclear Scientist
- Jack Sterling
- Enola Gay Tail Gunner
- Bert Stevens
- Man at Time Capsule Ceremony
- Cedric Stevens
- Evictee
- William Tannen
- Soldier at A-Bomb Test
- Richard Terry
- Enola Gay Radarman
- David Thursby
- English Bobby
- Frank Tomlinson
- Minor Role
- George Travell
- Tinian Co-Pilot
- H.T. Tsiang
- Prof. Okani
- George Turner
- Pilot
- Harry Tyler
- Man
- William Van Vleck
- Evictee
- Leslie Vincent
- English Junior Scientist
- Emmett Vogan
- Medical Major
- Hans von Morhart
- Danish Customs Man
- Eddy Waller
- Man
- Constance Weiler
- Minor Role
- Harry T. Wensel
- Wensel
- Carl Wester
- Construction Engineer
- Guy Williams
- Enola Gay Bombardier
- Ronald Wong
- Japanese Child
- Jack Worth
- Nazi Officer
