 Will Smith Captain Steve Hiller |
 Bill Pullman President Thomas J. Whitmore |
 Jeff Goldblum David Levinson |
 Mary McDonnell First Lady Marilyn Whitmore |
 Judd Hirsch Julius Levinson |
 Robert Loggia General William Gray, Chairman Joint Chiefs |
 Randy Quaid Russell Casse |
 Margaret Colin Constance Spano, White House Communications Director |
 Vivica A. Fox Jasmine Dubrow |
 James Rebhorn Albert Nimzicki, Secretary of Defense |
 Harvey Fierstein Marty Gilbert |
 Adam Baldwin Major Mitchell |
 Brent Spiner Dr. Brakish Okun |
 James Duval Miguel Casse |
 Lisa Jakub Alicia Casse |
 Giuseppe Andrews Troy Casse |
 Ross Bagley Dylan Dubrow |
 Bill Smitrovich Lt. Colonel Watson |
 Mae Whitman Patricia Whitmore |
 Harry Connick Jr. Captain Jimmy "Raven" Wilder |
 Kiersten Warren Tiffany |
 John Storey Dr. Isaacs |
 Frank Novak Teddy |
 Devon Gummersall Philip |
 Leland Orser Tech / Medical Assistant #1 |
 Mirron E. Willis Presidential Aide |
 Ross Lacy Presidential Aide |
 David Pressman Alex, Presidential Aide |
 Vivian Palermo Tech / Medical Assistant #2 |
 Raphael Sbarge Captain, Chief Ground Controller |
 Bobby Hosea Major Danowitz (according to credits) (Col. Harper according to what's onscreen) |
 Dan Lauria Commanding Officer, Space Command |
 Steve Giannelli Commander, USS Georgia (listed in credits as Radar Technician) |
 Carlos Lacamara El Toro Radar Operator |
 John Bennett Perry Secret Service Agent |
Troy Willis Secret Service Agent |
 Tim Kelleher Senior Airman, Ground Controller |
 Wayne Wilderson Area 51 Technician |
 Jay Acovone Area 51 Gate Guard |
 James Wong SETI Technician #1 |
 Thom Barry SETI Technician #2 |
 Jana Marie Hupp SETI Technician #3 |
 Matt Pashkow Second Officer in Space Command (Major Danowitz according to script) |
 Robert Pine Glenn Parness, White House Chief of Staff |
 Marisa Johnston Co-Worker #2 (as Marisa Morell) |
 Michael Winther Co-Worker #3 |
 Dexter Warren Co-Worker #4 |
Paul LeClair Co-Worker #5 |
Michael Vacca Lieutenant Peterson |
 David Chanel Secret Service Agent |
 John Capodice Mario |
 Greg Collins Military Aide |
 Derek Webster Sky Crane Pilot |
 Mark Fite Marine Fighter Pilot |
Eric Neal Newman Pilot |
 Levan Uchaneishvili Russian Pilot |
 Kristof Konrad Russian Pilot |
 Kevin Sifuentes Tank Commander |
 Elston Ridgle Soldier Guarding Helicopter |
 Randy Oglesby Mike Dodge |
 Jack Moore Stoney Jackson |
 Barry Del Sherman Street Preacher |
 Lyman Ward Secret Service Agent |
 Anthony Crivello Lincoln |
Richard Speight Jr. Ed |
 Barbara Beck Monica Soloway |
 Joe Fowler Reporter |
Andrew Warne Reporter |
Sharon Tay Reporter |
Peter J. Lucas Russian Reporter (as Peter Jozef Lucas) |
Yelena Danova Russian Newscaster |
Johnny Kim Korean Newscaster (as Derek Kim) |
 Vanessa J. Wells Newscaster |
 Gary W. Cruz Carlos Ortiz, LA Newscaster |
 Ron Pitts Video Newscaster |
 Wendy L. Walsh Herself |
| Christine Devine Video Newscaster |
 | Mark Thompson Video Newscaster |
| Ernie Anastos Rex Black, New York Newscaster |
 | Kevin Cooney Commander-in-Chief, US Atlantic Command |
 | Rance Howard Chaplain |
 | Nelson Mashita Japanese Technician |
 | Jeff Phillips B-2 Pilot |
 | Sayed Badreya Iraqi Pilot |
 | Adam Tomei Sonarman, USS Georgia |
 | John Bradley Lucas |
 | Kimberly Beck Housewife |
 | Thomas F. Duffy Lieutenant |
 | Andrew Keegan Older Boy |
 | Jon Matthews Thomson |
 | Jim Piddock Reginald |
| Frederic W. Barnes Himself (as Fred Barnes) |
 | Eleanor Clift Herself |
| Jerry Dunphy Himself |
| Jack Germond Himself |
 | Morton Kondracke Himself |
 | John McLaughlin Himself |
| Barry Nolan Himself |
| George Putnam Himself |
| Eric Michael Zee Northridge Field Reporter |
 | Pat Skipper Redneck |
| Carlos Lara Farmer Kid |
| Mike Monteleone Butler |
| Lee Strauss Elvis Fanatic |
| Lisa Star Woman on Roof |
 | Malcolm Danare Intellectual on Roof |
| Arthur Brooks Trucker on Roof |
| Michael Moertl Thief |
| James J. Joyce Master Chief Petty Officer |
| Joyce Cohen Kim Peters |
 | Julie Moran Herself - "Entertainment Tonight" Reporter |
| Robin Groth Flagstaff News Anchor |
| Richard Pachorek LAPD Helicopter Pilot |
 | Gary A. Hecker Alien Vocal Effects (as Gary Hecker) |
 | Frank Welker Special Vocal Effects |
| Jonathan Adler Secret Service Agent (uncredited) |
 | Erick Avari SETI Chief (uncredited) |
 | Greg Bronson Police Officer at White House (uncredited) |
| Dean Devlin Eagle 2 Pilot (uncredited) |
| Daren Dochterman British News Translator (uncredited) |
 | Volker Engel Man in Office (uncredited) |
 | Bob Friend Himself - "Sky News" Anchorman (uncredited) |
| Jeffrey Gold German Fighter Pilot (uncredited) |
| Michael Haddad Trailer Trash (uncredited) |
| Lincoln D. Hiatt Colin Barclay (uncredited) |
| Jonathan Khan Pilot (uncredited) |
| Darin Mangan Staff Sergeant (uncredited) |
 | Scott McKinley Joint Chiefs of Staff (uncredited) |
| Bryan D. Moss Israeli Fighter Pilot (uncredited) |
| Roy Newton Pilot (uncredited) |
| Gary Pike Helicopter Passenger (uncredited) |
| Darla Rae Protestor - Omni Hotel (uncredited) |
 | Nectar Rose Stripper (uncredited) |
| Bonnie Silco Bride (uncredited) |
 | Tadao Tomomatsu Big Hat Guy on Tower (uncredited) |
| Michael A. Valenzano Young Pilot (uncredited) |
 | Tracey Walter Area 51 Lab Technician (uncredited) |
 | James With British Pilot (uncredited) |
| James Woodson Pilot (uncredited) |
 | Dakota Boomer |
 | Unknown 22068-2 AWACS Pilot |
 | Unknown 22068-3 Area 51 Gate Guard #2 |
 | Unknown 22068-4 Asian Pilot |
 | The White House The White House |
 | World Trade Center World Trade Center |