Will Smith as Capt. Steven Hiller

Bill Pullman as President Thomas J. Whitmore

Jeff Goldblum as David Levinson

Mary McDonnell as Marilyn Whitmore

Judd Hirsch as Julius Levinson

Robert Loggia as General William Grey

Randy Quaid as Russell Casse

Margaret Colin as Constance Spano

James Rebhorn as Albert Nimzicki

Harvey Fierstein as Marty Gilbert

Adam Baldwin as Major Mitchell

Brent Spiner as Dr. Brackish Okun

James Duval as Miguel

Vivica A. Fox as Jasmine Dubrow

Lisa Jakub as Alicia

Ross Bagley as Dylan

Mae Whitman as Patricia Whitmore

Bill Smitrovich as Captain Watson

Kiersten Warren as Tiffany

Harry Connick Jr. as Capt. Jimmy Wilder

Giuseppe Andrews as Troy

John Storey as Dr. Isaacs

Frank Novak as Teddy

Devon Gummersall as Philip

Leland Orser as Techy / Med Asst #1

Mirron E. Willis as Aide

Ross Lacy as Aide

David Pressman as Whitmore's Aide

Vivian Palermo as Tech / Med Asst

Raphael Sbarge as Commander / Tech

Bobby Hosea as Commanding Officer

Dan Lauria as Commanding Officer

Steve Giannelli as Radar Tech

Eric Paskel as Radar Tech

Carlos Lacámara as Radar Operator

John Bennett Perry as Secret Serviceman

Troy Willis as Secret Serviceman

Tim Kelleher as Technician

Wayne Wilderson as Area 51 Technician

Jay Acovone as Area 51 Guard

James Wong as SETI Tech One

Thom Barry as SETI Tech Two

Jana Marie Hupp as SETI Tech Three

Matt Pashkow as Second Officer

Robert Pine as Chief of Staff

Marisa Johnston as Co-Worker #2

Michael Winther as Co-Worker #3

Warren Dexter Beatty as Co-Worker #4

Paul LeClair as Co-Worker #5

Michael Vacca as Lt. Peterson

David Channell as Secret Service Agent

John Capodice as Mario

Greg Collins as Military Aide

Derek Webster as Sky Crane Pilot

Mark Fite as Pilot

Eric Neal Newman as Pilot

Levan Uchaneishvili as Russian Pilot

Kristof Konrad as Russian Pilot

Kevin Sifuentes as Tank Commander

Elston Ridgle as Soldier

Randy Oglesby as Mechanic

Jack Moore as Mechanic

Barry Del Sherman as Street Preacher

Lyman Ward as Secret Service Guy

Anthony Crivello as Lincoln

Richard Speight Jr. as Ed

Barbara Beck as Monica Soloway

Joe Fowler as Reporter

Andrew Warner as Reporter

Sharon Tay as Reporter

Peter J. Lucas as Russian Reporter

Yelena Danova as Russian Newscaster

Johnny Kim as Korean Newscaster

Vanessa J. Wells as Newscaster

Jessika Cardinahl as German Video Newscaster

Gary W. Cruz as Video Newscaster

Ron Pitts as Video Newscaster

Wendy L. Walsh as Video Newscaster

Christine Devine as Video Newscaster

Mark Thompson as Video Newscaster

Ernie Anastos as Rex Black / NY Newscaster

Kevin Cooney as Atlantic Air CINC

Rance Howard as Chaplain

Nelson Mashita as Japanese Tech

Jeff Phillips as B-2 Pilot

Sayed Badreya as Arab Pilot

Adam Tomei as Sailor

John Bradley as Lucas

Kimberly Beck as Housewife

Thomas F. Duffy as Lieutenant

Andrew Keegan as Older Boy

Jon Matthews as Thomson

Jim Piddock as Reginald

Frederic W. Barnes as Self

Eleanor Clift as Self

Jerry Dunphy as Self

Jack Germond as Self

Morton Kondracke as Self

John McLaughlin as Himself

Barry Nolan as Self

George Putnam as Self

Eric Michael Zee as Northridge Field Reporter

Pat Skipper as Redneck

Carlos Lara as Farmer Kid

Mike Monteleone as Butler

Lee Strauss as Elvis Fanatic

Lisa Star as Woman on Roof

Malcolm Danare as Intellectual on Roof

Arthur Brooks as Trucker on Roof

Michael Moertl as Thief

James J. Joyce as Master C. P. O.

Joyce Cohen as Kim Peters (Reporter)

Julie Moran as Entertainment Tonight Reporter

Robin Groth as Flagstaff News Anchor

Richard Pachorek as LAPD Helicopter Pilot

Dakota as Boomer

Gary A. Hecker as Alien Vocal Effects (voice)

Frank Welker as Special Vocal Effects (voice)