| Person | Type | Job | Role(s) |
|---|---|---|---|
 Brian Avery | Crew | Crew | Stunts |
 Brian Grazer | Crew | Production | Producer |
 Buddy Van Horn | Crew | Crew | Stunt Coordinator |
 Chuck Waters | Crew | Crew | Stunts |
 Clint Eastwood | Crew | Directing | Director, Producer, Original Music Composer |
 Deborah Hopper | Crew | Costume & Make-Up | Costume Design |
 Dustin Lance Black | Crew | Writing | Writer |
 Erica Huggins | Crew | Production | Executive Producer |
 Fiona Weir | Crew | Production | Casting |
Gary Fettis | Crew | Art | Set Decoration |
Gary D. Roach | Crew | Editing | Editor |
Greg Berry | Crew | Art | Art Direction |
Gregg Rudloff | Crew | Sound | Sound Re-Recording Mixer |
Jacob Chambers | Crew | Crew | Stunts |
James J. Murakami | Crew | Art | Production Design |
Joel Cox | Crew | Editing | Editor |
 Matthew R. Anderson | Crew | Crew | Stunts |
 Patrick M. Sullivan | Crew | Art | Art Direction |
 Robert Lorenz | Crew | Production | Producer |
Tim Moore | Crew | Production | Executive Producer |
 Tom Stern | Crew | Camera | Director of Photography |
 Justin Gant | Crew | Crew | Stunts |
Kevin Murray | Crew | Sound | Assistant Sound Editor |
 Amanda Schull | Cast | Actress | Anita Colby |
 Cheryl Lawson | Cast | Actress | Palmer's Wife |
Chris Caputo | Cast | Bronx Baker | |
 Christian Clemenson | Cast | Actor | Inspector Schell |
 Damon Herriman | Cast | Actor | Bruno Hauptmann |
 David Clennon | Cast | Actor | Senator Friendly |
 Denis O'Hare | Cast | Actor | Albert Osborne |
 Dermot Mulroney | Cast | Actor | Colonel Schwarzkopf |
 Elizabeth Karr | Cast | Actress | Secretary (uncredited) |
 Gary Werntz | Cast | Actor | Attorney General |
 Geoff Pierson | Cast | Actor | Mitchell Palmer |
 Geoff Stults | Cast | Actor | Raymond Caffrey |
 Gerald Downey | Cast | Actor | FBI Agent |
 Jack Axelrod | Cast | Actor | Caminetti |
 Jack Donner | Cast | Actor | Edgar's Father |
 Jeffrey Donovan | Cast | Actor | Robert Kennedy |
 Jessica Hecht | Cast | Actress | Emma Goldman |
 Johnny Cicco | Cast | Actor | Young Agent |
 Josh Hamilton | Cast | Actor | Robert Irwin |
 Josh Lucas | Cast | Actor | Charles Lindbergh |
 Josh Stamberg | Cast | Actor | Agent Stokes |
 Judi Dench | Cast | Actress | Anna Marie Hoover |
 Ken Howard | Cast | Actor | Harlan Fiske Stone |
 Kyle Eastwood | Cast | Actor | Stork Club Band |
 Lea Coco | Cast | Actor | Agent Sisk |
 Lea Thompson | Cast | Actress | Lela Rogers |
 Leonardo DiCaprio | Cast | Actor | John Edgar Hoover |
 Martin Luther King Jr. | Cast | Actor | Self (archive footage) (uncredited) |
 Michael O'Neill | Cast | Actor | Senator McKellar |
 Miles Fisher | Cast | Actor | Agent Garrison |
 Naomi Watts | Cast | Actress | Helen Gandy |
 Pat Nixon | Cast | Actress | Self (archive footage) (uncredited) |
 Richard Nixon | Cast | Actor | Self (archive footage) (uncredited) |
 Robert Fleet | Cast | Edgar's Mother's Doctor | |
 Roberta Bassin | Cast | Actress | Roosevelt's Secretary |
 Ryan McPartlin | Cast | Actor | Lawrence Richey |
 Stephen Root | Cast | Actor | Arthur Koehler |
 Steve Monroe | Cast | Actor | Restaurant Host |
 Zach Grenier | Cast | Actor | John Condon |
 Aaron Lazar | Cast | Actor | Prosecutor Wilentz |
 Belinda Gosbee | Cast | Actress | Gangster's Moll (uncredited) |
 Billy Smith | Cast | Actor | Secret Service Officer |
 Ed Westwick | Cast | Actor | Agent Smith |
Eric Larkin | Cast | Actor | Fred Hunter |
 Armie Hammer | Cast | Actor | Clyde Tolson |
Brady Matthews | Cast | Actor | Inspector |
 Emily Alyn Lind | Cast | Actress | Shirley Temple |
 Fileena Bahris | Cast | Actress | Starlet (uncredited) |
 Gunner Wright | Cast | Actor | Dwight Eisenhower |
 Jenny Phagan | Cast | Actress | Baker's Wife |
 Kaitlyn Dever | Cast | Actress | Palmer's Daughter |
 Leslie Augustine | Cast | Actress | Lindbergh Nanny (uncredited) |
Lindsay Lucas-Bartlett | Cast | Actress | Hollywood Starlet (uncredited) |
Thomas Langston | Cast | Actor | Young Boy |
 Adam Driver | Cast | Actor | Walter Lyle |
 Eric Frentzel | Cast | Actor | William Mahan |
 Jamie Noel | Cast | Actress | Racetrack Gambler (uncredited) |
 Sadie Calvano | Cast | Actress | Edgar's Niece |
 Barbara Keegan | Cast | Actress | Bombing Witness |
 Gregory Hoyt | Cast | Actor | Agent One |
 Kelly Lester | Cast | Actress | Head Secretary |
Michael James Faradie | Cast | Actor | Bureau Agent (1919) |
Jennipher Foster | Cast | Actress | Lucille Ball (uncredited) |
 David A. Cooper | Cast | Actor | Franklin Roosevelt |
Dylan Burns | Cast | Hoover as a Child | |
Shannon McClain Robertson | Cast | Actress | African American Woman (as Shannon McClain) |
Emily Banks | Cast | Actress | Radical Citizen (uncredited) |
| Person | Type | Job | Role(s) |
