| 角色 | 演員 | 配音 |
| Harry S. Truman | 加里·西尼斯Gary Sinise | ---- |
| Bess Truman | 黛安娜·斯卡維德Diana Scarwid | ---- |
| Henry L. Stimson (as Richard Dysart) | Richard A. Dysart | ---- |
| Charlie Ross | 科魯姆·費奧瑞Colm Feore | ---- |
| Sam Rayburn | 詹姆斯·蓋蒙James Gammon | ---- |
| Clark Clifford | 托尼·戈德溫Tony Goldwyn | ---- |
| Boss Tom Pendergast | 帕特·亨格爾Pat Hingle | ---- |
| Gen. George C. Marshall | Harris Yulin | ---- |
| Frank Vassar | Leo Burmester | ---- |
| Margaret Truman | Amelia Campbell | ---- |
| Elizabeth Moore | Virginia Capers | ---- |
| Bob Hannagan | John Finn | ---- |
| Eddie Jacobsen | 齊傑洛·艾文克Zeljko Ivanek | ---- |
| Lt. Jim Pendergast | David Lansbury | ---- |
| Dean Acheson | Remak Ramsay | ---- |
| Eleanor Roosevelt | Marian Seldes | ---- |
| Madge Wallace Gates | 羅伊絲·史密斯Lois Smith | ---- |
| J. Lester Perry | Richard Venture | ---- |
| Gen. Douglas MacArthur | Daniel von Bargen | ---- |
| Marine | Craig Benton | ---- |
| Engineer | Jim Birdsall | ---- |
| Alonzo | Freeman Bosley Sr. | ---- |
| Black delegate | Walter Coppage | ---- |
| Mama Truman | Nora Denney | ---- |
| Female reporter | Jessica Drake | ---- |
| Producer | John Durbin | ---- |
| Lazy worker | Joe Erker | ---- |
| Newswoman | Peggy Freisen | ---- |
| MacArthur reporter | David Fritts;Harry Gibbs; | ---- |
| MacArthur's officer | Tim Gillin | ---- |
| Eisenhower's aide | Larry Greer | ---- |
| Senator #1 | Wiley Harker | ---- |
| Convention reporter #1 | Marlon Hoffman | ---- |
| Politician #1 | Harold S. Herd | ---- |
| Senator #2 | Gary Holcombe | ---- |
| Margaret at 7 | Rachel Holferty | ---- |
| Jester | Brad Holiday | ---- |
| Judge Stone (as Chief Justice Richard Holmes) | Richard W. Holmes | ---- |
| Sgt. O'Hara | Hollis Huston | ---- |
| Female reporter #3 | Jeannine Hutchings | ---- |
| Senator #3 | Joneal Joplin | ---- |
| Vietta | Lynn King | ---- |
| Usher #2 | Jonathon Lamer | ---- |
| Judge Vrooman | Jerry Longe | ---- |
| Politician #3 | Robert R. Lynn | ---- |
| Convention reporter #2 | Michael T. McGraw | ---- |
| Fred Wallace (as Joseph P. Moynihan) | Joseph Patrick Moynihan | ---- |
| Operator | Addison Myers | ---- |
| Dixiecrat | Holmes Osborne | ---- |
| Female reporter #2 | Stellie Siteman | ---- |
| Page | Peter Slowey | ---- |
| Pendergast politician | John Smith | ---- |
| Reporter #2 (as David Snell) | David Rees Snell | ---- |
| Usher #1 | Brian Stemmler | ---- |
| Barnett | Jerel Taylor | ---- |
| Female reporter #1 | Donna Thomason | ---- |
| Reporter #1 | Dean Vivian | ---- |
| Reporter | Cheryl Weaver | ---- |
| Judge Barr | Charles Whitman | ---- |
| Groom | Robert Wilson | ---- |
| Soldier | Sean Kaplan | ---- |
| White House Waiter | Sean Kaplan | ---- |
| Macarthur's Trooper | Tim Wrobel | ---- |
| Himself (at Potsdam) (archive footage) (uncredited) | Clement Attlee, William D. Leahy, Vyacheslav Molotov | ---- |
| Woman in train station (uncredited) | Shannon Breckenridge | ---- |
| Himself (arrives in Berlin with Truman) (archive footage) (uncredited) | James F. Byrnes | ---- |
| Himself (archive footage) (uncredited) | Winston Churchill, Thomas E. Dewey, Dwight D. Eisenhower, John L. Lewis, 理查德·尼克松Richard Nixon, Joseph Stalin | ---- |
| Himself (at Potsdam) (archive footage) (uncredited) (unconfirmed) | Averell Harriman | ---- |
| (uncredited) | Mat Hostetler | ---- |
| Himself (assists Shigemitsu) (archive footage) (uncredited) | Toshikazu Kase | ---- |
| Extra (uncredited) | Angella Kaye | ---- |
| Himself (in tickertape parade) (archive footage) (uncredited) | Douglas MacArthur | ---- |
| Himself (with Stalin in Red Square) (archive footage) (uncredited) | Georgi Malenkov | ---- |
| Himself (abuses Acheson, Truman) (archive footage) (uncredited) | Joseph McCarthy | ---- |
| Man in crowd (uncredited) | Terry M. Moore | ---- |
| Dinner Speaker (uncredited) | 邁克爾·墨菲Michael Murphy | ---- |
| Herself (at Eisenhower inauguration) (archive footage) (uncredited) | Pat Nixon | ---- |
| Franklin D. Roosevelt (uncredited) | Lee Richardson | ---- |
| Himself (funeral) (archive footage) (uncredited) | Franklin Delano Roosevelt | ---- |
| Himself (with nomination signs) (archive footage) (uncredited) (unconfirmed) | James Roosevelt | ---- |
| Himself (signs surrender in Tokyo Bay) (archive footage) (uncredited) | Mamoru Shigemitsu | ---- |
| H.V. Kaltenborn (uncredited) | ---- | John Stephenson |
| Himself (with Churchill at Potsdam, with Churchill in Fulton) (archive footage) (uncredited) | Harry S. Truman | ---- |