- Mary Steenburgen - Hannah Nixon
- J.T. Walsh - John Ehrlichman
- James Woods - H.R. Haldeman
- Brian Bedford - Clyde Tolson
- Kevin Dunn - Charles Colson
- Fyvush Finkel - Murray Chotiner
- Annabeth Gish - Julie Nixon Eisenhower
- Tom Bower - Frank Nixon
- Tony Goldwyn - Harold Nixon
- Larry Hagman - Jack Jones
- Edward Herrmann - Nelson Rockefeller
- Madeline Kahn - Martha Mitchell
- Dan Hedaya - Trini Cardoza
- Tony Lo Bianco - Johnny Roselli
- Saul Rubinek - Herb Klein
- Robert Beltran - Frank Sturgis
- John Cunningham - Bob
- John Diehl - Gordon Liddy
- John C. McGinley - Earl in Training Film
- Michael Chiklis - TV Director
- David Barry Gray - Richard Nixon, 19 Years Old
- Joanna Going - Young Student
- George Plimpton - President's Lawyer
- Corey Carrier - Richard Nixon, 12 Years Old
- Ronald von Klaussen - James McCord, Watergate Burglar
- John Bedford Lloyd - Cuban Man
- Kamar de los Reyes - Eugenio Martinez, Watergate Burglar
- Enrique Castillo - Virgilio Gonzales, Watergate Burglar
- James Pickens Jr. - Black Orator
- Victor Rivers - Cuban Plumber
- Bridgette Wilson-Sampras - Sandy
- Drew Snyder - Moderator
- Ric Young - Mao Tse-Tung
- Sean Stone - Donald Nixon
- Joshua Duvall Preston - Arthur Nixon
- Jack Wallace - Football Coach
- Julie Condra - Young Pat Nixon
- Annette Helde - Happy Rockefeller
- Howard Platt - Lawyer at Party
- T.J. Kennedy - Convention Announcer
- Harry S. Murphy - Fan #1
- Pamela Dickerson - Girlfriend
- O'Neal Compton - Texas Man
- Wilson Cruz - Joaquin, Hoover's Servant
- Marley Shelton - Tricia Nixon Cox
- James Karen - Bill Rogers
- Richard Fancy - Mel Laird
- Peter Carlin - Student #1
- Michelle Krusiec - Student #2
- Wass Stevens - Protester
- Chuck Pfeiffer - Secret Service Agent #2
- Alexander Butterfield - White House Staffer
- Mark Steines - White House Security
- Bai Ling - Chinese Interpreter
- Jon Tenney - Reporter #1
- Julie Araskog - Reporter #2
- Donna Dixon - Maureen Dean
- John Stockwell - Staffer #1
- Charles Haugk - Staffer #2
- Boris Sichkin - Leonid Brezhnev
- Marilyn Rockafellow - Helen Smith
- Bill Bolender - Bethesda Doctor
- Melinda Renna - Bethesda Nurse
- Tony Plana - Manolo Sanchez
- Sam Waterston - Richard Helms
- Chuck Riley - Narrator (voice, uncredited)
-
Oliver Stone
- Stephen J. Rivele
- Dan Halsted
- Richard Rutowski
- Clayton Townsend
- Oliver Stone
- Andrew G. Vajna
- Mark Lanza
- Dino DiMuro
- Kelly Oxford
- Paul Massey
- John Williams
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