 | Kevin Costner als Eliot Ness |
 | Sean Connery als Jim Malone |
 | Charles Martin Smith als Oscar Wallace |
 | Andy García als George Stone |
 | Robert De Niro als Al Capone |
 | Richard Bradford als Mike |
 | Jack Kehoe als Payne |
 | Brad Sullivan als George |
 | Billy Drago als Nitti |
 | Patricia Clarkson als Ness' Wife |
 | Vito D'Ambrosio als Bowtie Driver |
 | Steven Goldstein als Scoop |
| Peter Aylward als Lt. Anderson |
 | Don Harvey als Preseuski |
 | Robert Swan als Mountie Captain |
| John J. Walsh als Bartender |
 | Del Close als Alderman |
| Colleen Bade als Mrs. Blackmer |
 | Greg Noonan als Rangemaster |
| Sean Grennan als Cop Cousin |
| Larry Viverito Sr. als Italian Waiter |
| Kevin Michael Doyle als Williamson |
 | Mike Bacarella als Overcoat Hood |
 | Michael P. Byrne als Ness' Clerk |
| Kaitlin Montgomery als Ness' Daughter |
| Aditra Kohl als Blackmer Girl |
| Charles Keller Watson als Reporter |
 | Larry Brandenburg als Reporter |
 | Chelcie Ross als Reporter |
| Tim Gamble als Reporter |
 | Pat Billingsley als Bailif |
| Sam Smiley als Bailiff |
| John Bracci als Fat Man |
| Jennifer Anglin als Woman in Elevator |
| Eddie Minasian als Butler |
| Anthony Mockus Sr. als Judge |
 | Will Zahrn als Defense Attorney |
| Louie Lanciloti als Barber |
 | Vince Viverito als Bodyguard |
 | Valentino Cimo als Bodyguard |
 | Joe Greco als Bodyguard |
 | Clem Caserta als Bodyguard |
| Bob Martana als Bodyguard |
| Joseph Scianablo als Bodyguard |
| George S. Spataro als Bodyguard |
| Melody Rae als Union Station Woman |
 | Robert Miranda als Gunned Head |
| James Guthrie als Pagliacci |
| Basil Reale als Hotel Clerk |
 | John Barrowman als Street Person (uncredited) |
| Jimmy Borto als Court Reporter (uncredited) |
 | Stephen Burrows als Hoodlum (uncredited) |
| Ernest Capponi als Gangster at Round Table (uncredited) |
| Justin De Rosa als Capone's Hitman (uncredited) |
 | Eddy Donno als Capone's Hitman (uncredited) |
| Jack Fitzstephens als Train Announcer (uncredited) |
| Patricia E. Harrington als Street Person (uncredited) |
 | Collin Hymes als Baby in Carriage (uncredited) |
 | Clifton James als District Attorney (uncredited) |
| Matt Johnston als Union Station Bodyguard (uncredited) |
| Robert Minkoff als Man (uncredited) |
| William Rossman als Gangster (uncredited) |
| Gerald B. Greenberg | Editor |
| Brian De Palma | Director |
| Art Linson | Producer |
| David Mamet | Writer |
| Oscar Fraley | Book |
| Eliot Ness | Book |
| Stephen H. Burum | Director of Photography |
| Ennio Morricone | Original Music Composer |
| Ennio Morricone | Conductor |
| William A. Elliott | Art Direction |
| Hal Gausman | Set Decoration |
| Mali Finn | Casting |
| Bill Pankow | Editor |
| James W. Skotchdopole | Second Assistant Director |
| Jack Fitzstephens | Sound Editor |
| Michael Berenbaum | Assistant Sound Editor |
| Marilyn Vance | Costume Design |
| Gilbert B. Combs | Stunts |
| Dick Vorisek | Sound Re-Recording Mixer |
| Dan Sable | Supervising Sound Editor |
| Tara Timpone | First Assistant Editor |
| Michele Imperato | Assistant Production Coordinator |
| Gary Hymes | Stunt Coordinator |
| Glen Trotiner | Assistant Director |
| Sioux Richards | Script Supervisor |
| Susan J. Bonno-Buckner | Assistant Accountant |
| Gary Epper | Stunts |
| Eric Schwab | Location Manager |
| Ray Hubley | Editorial Services |
| Ray Hubley | Associate Editor |
| Joe Napolitano | First Assistant Director |
| Raymond Hartwick | Unit Production Manager |
| Raymond Hartwick | Associate Producer |
| Allen Hall | Special Effects Coordinator |
| Zade Rosenthal | Still Photographer |
| Bob Olari | Sound Recordist |
| Tim A. Davison | Stunts |
| Gregory Lundsgaard | Steadicam Operator |
| E.C. Chen | Set Designer |
| Winnie D. Brown | Costume Supervisor |
| Mel Zelniker | ADR Recordist |
| John Sweeney | Assistant Property Master |
| Bette Iverson | Hairstylist |
| Michael Hancock | Makeup Artist |
| Anne Marie Stein | Unit Publicist |
| Michael DiCosimo | Dolby Consultant |
| Thomas S. Drescher | Music Editor |
| Shari Leibowitz | Production Coordinator |
| James M. Tanenbaum | Sound Mixer |
| Kelly R. Borisy | Grip |
| Richard Patrick | Second Second Assistant Director |
| Bob Munoz | Second Company Grip |
| Matt Johnston | Stunts |
| Emile Charlap | Music Supervisor |
| George DiLeonardi | Transportation Captain |
| Sam Moore | Property Master |
| Douglas Ryan | Camera Operator |
| Tim Griffith | Chief Lighting Technician |
| Dale R. Janus | Boom Operator |
| Alex Touyarot | First Assistant Camera |
| Deborah Peretz | Assistant Editor |
| Harriet Fidlow | ADR Editor |
| John Moses | Musician |
| Elisha Birnbaum | Foley Supervisor |
| Robert W. Dutton | Leadman |
| Dick Hansen | Set Dressing Artist |
| Glenn Williams | Cableman |
| Matthew Benjamin | Craft Service |
| Clay Bartholomew | Driver |
| Robert A. Hogan | Transportation Co-Captain |
| Hayden D. Anglin | Transportation Coordinator |
| Richard Ritchie | Color Timer |
| Tim Phelps | Rigging Gaffer |
| Eve Cauley | Research Assistant |
| George R. Schrader | Dolly Grip |
| Frank Keever | First Company Grip |
| Faith Jones | Apprentice Sound Editor |
| Marvin Gardner | Special Effects Technician |
| Richard Clarkson | Second Assistant Camera |
| Maureen Cunningham | Assistant Location Manager |
| Gregory A. Jackson | Location Assistant |
| Mort Hyatt | Assistant Chief Lighting Technician |
| Cyd Adams | Production Assistant |
| Douglas Kraner | Technical Advisor |
| Sherwin Tarnoff | Weapons Master |
