| Robert Downey Jr. - Tony Stark / Iron Man |
| Gwyneth Paltrow - Virginia "Pepper" Potts |
| Don Cheadle - James "Rhodey" Rhodes / War Machine |
| Scarlett Johansson - Natalie Rushman / Natasha Romanoff / Black Widow |
| Sam Rockwell - Justin Hammer |
| Mickey Rourke - Ivan Vanko / Whiplash |
| Samuel L. Jackson - Nick Fury |
| Clark Gregg - Phil Coulson |
| John Slattery - Howard Stark |
| Garry Shandling - Senator Stern |
| Paul Bettany - J.A.R.V.I.S. (voice) |
| Kate Mara - U.S. Marshal |
| Leslie Bibb - Christine Everhart |
| Jon Favreau - Harold "Happy" Hogan |
| Christiane Amanpour - Christiane Amanpour |
| Philippe Bergeron - Detective Lemieux |
| James Bethea - Security Force #1 |
| Michael Bruno - Security Force #2 |
| Kate Clark - Expo Fan |
| Luminita Docan - Russian Newscaster |
| François Duhamel - French Photographer |
| Larry Ellison - Larry Ellison |
| Adam Goldstein - Adam "DJ AM" Goldstein |
| Tim Guinee - Major Allen |
| Eric L. Haney - General Meade |
| Ali Khan - 10 Rings Gangster |
| Evgeniy Lazarev - Anton Vanko |
| Stan Lee - Stan Lee |
| Isaiah Guyman Martin IV - AV Operator |
| Helena Mattsson - Rebecca |
| Anya Monzikova - Rebeka |
| Keith Middlebrook - Expo Cop |
| Margy Moore - Bambi Arbogast |
| Olivia Munn - Chess Roberts |
| Elon Musk - Elon Musk |
| Bill O'Reilly - Bill O'Reilly |
| Alejandro Patiño - Strawberry Vendor |
| Davin Ransom - Young Tony Stark |
| Karim Saleh - Guard |
| Brian Schaeffer - Hammer Expo Tech |
| Phillipe Simon - French Waiter |
| Jack White - Jack |
| Melanie Brown - Ironette Dancer |
| Krystal Ellsworth - Ironette Dancer |
| Victoria Gracie - Ironette Dancer |
| Gina Cantrell - Ironette Dancer |
| Renee Herlocker - Ironette Dancer |
| Jill Ann Pineda-Arnold - Ironette Dancer |
| Sandy Colton - Ironette Dancer |
| Annika Ihnat - Ironette Dancer |
| Jenny Robinson - Ironette Dancer |
| Lindsay Dennis - Ironette Dancer |
| Jennifer D. Johnson - Ironette Dancer |
| Lindsay Rosenberg - Ironette Dancer |
| Hannah Douglass - Ironette Dancer |
| Brooke Long - Ironette Dancer |
| Rachele Brooke Smith - Ironette Dancer |
| Nadine Ellis - Ironette Dancer |
| Kylette Zamora - Ironette Dancer |
| Ted Alderman - News Cameraman (uncredited) |
| Donessa Alexander - Birthday Party Guest / Expo Guest (uncredited) |
| Martin Andris - Expo Greeter (uncredited) |
| Cassity Atkins - Expo Patron (uncredited) |
| Gregory Baldi - Monaco Grand Prix Restaurant Guest (uncredited) |
| Elya Beer - Bartender (uncredited) |
| Ayelet Ben-Shahar - Model (uncredited) |
| Jordan Bobbitt - Little Girl at EXPO Gala (uncredited) |
| Chris Borden - Dignitary / Expo Attendee (uncredited) |
| Pete Brown - Air Force Major (uncredited) |
| Basilina Butler - Tony Stark Racing Fan (uncredited) |
| John Ceallach - Captain Anders (uncredited) |
| Katie Cleary - Beautiful Girl (uncredited) |
| Ajarae Coleman - Expo Guest (uncredited) |
| Rick L. Dean - Monte Carlo Race Fan (uncredited) |
| Timothy 'TJ' James Driscoll - French Prison Guard #2 (uncredited) |
| Jasmine Dustin - Watermelon Girl (uncredited) |
| Mark Casimir Dyniewicz - Justin Hammer Expo Attendee (uncredited) |
| Sam Felman - Stark Expo Attendee (uncredited) |
| Caitlin Gallo - I Love You girl (uncredited) |
| Shakira Vanise Gamble - Pepper's Party Guest (uncredited) |
| Paul Grace - French Prison Guard #1 (uncredited) |
| James Granville - Expo Fan (uncredited) |
| Kathryn Henzler - Expo Attendee (uncredited) |
| Jennifer Lynne Johnson - Expo Attendee (uncredited) |
| Mark Kubr - Prisoner (uncredited) |
| Cameron Lee - Senate Page (uncredited) |
| Jee-Yun Lee - Reporter (archive footage) (uncredited) |
| Waymond Lee - Expo Guest (uncredited) |
| Mathew Lorenceau - Prison Guard Chevalier (uncredited) |
| Christopher Maleki - Reporter (uncredited) |
| Richard Markman - Photographer at Senate hearing (uncredited) |
| Bryan McCoy - Expo Guest (uncredited) |
| Ed Moy - Awards Attendee (uncredited) |
| Delka Nenkova - Russian Woman (uncredited) |
| Tony Nevada - SWAT Sergeant Bellows (uncredited) |
| Allison Ochmanek - Watermelon Girl (uncredited) |
| Nicolas Pajon - French Reporter (uncredited) |
| H.E. Victor J.W. Pekarcik III - White House Chief of Staff (uncredited) |
| Erin Pickett - Expo Guest (uncredited) |
| Olivia Presley - Expo VIP (uncredited) |
| Steven James Price - Senate Gallery Member (uncredited) |
| Kiana Prudhont - Expo Kid (uncredited) |
| Tanner Alexander Redman - 1960's Film Crew (uncredited) |
| Tanoai Reed - Security Guard Fighting Happy Hogan (uncredited) |
| Kelly Sarah - Stark Expo Attendee (uncredited) |
| Torin Sixx - Pepper's Birthday Party Guest (uncredited) |
| Peter Trenholm Smith - Senator (uncredited) |
| Grace Stanley - Model (uncredited) |
| Doug Swander - Party Guest (uncredited) |
| Michael A. Templeton - US Senator (uncredited) |
| Rosa Tyabji - Background (uncredited) |
| Peter Sebastian Wrobel - Tony Stark Usher (uncredited) |
| Maria Zambrana - Expo Attendee (uncredited) |
| Nick W. Nicholson - Stark Expo Attendee (uncredited) |
