| Shia LaBeouf | ... | Sam Witwicky |
| Megan Fox | ... | Mikaela Banes |
| Josh Duhamel | ... | Captain Lennox |
| Tyrese Gibson | ... | USAF Tech Sergeant Epps |
| Rachael Taylor | ... | Maggie Madsen |
| Anthony Anderson | ... | Glen Whitmann |
| Jon Voight | ... | Defense Secretary John Keller |
| John Turturro | ... | Agent Simmons |
 | Michael O'Neill | ... | Tom Banacheck |
| Kevin Dunn | ... | Ron Witwicky |
| Julie White | ... | Judy Witwicky |
| Amaury Nolasco | ... | ACWO Jorge "Fig" Figueroa |
| Zack Ward | ... | First Sergeant Donnelly |
| Luis Echagarruga | ... | Ranger Team |
| Pat Mulderrig | ... | Ranger Team (as Patrick Mulderrig) |
| Brian Shehan | ... | Ranger Team |
| Michael Trisler | ... | Ranger Team |
| Ashkan Kashanchi | ... | Mahfouz |
| Rizwan Manji | ... | Akram |
| William Morgan Sheppard | ... | Captain Witwicky (as W. Morgan Sheppard) |
| C.J. Thomason | ... | Sailor |
| Bernie Mac | ... | Bobby Bolivia |
| Carlos Moreno Jr. | ... | Manny |
| Johnny Sanchez | ... | Clown |
| John Robinson | ... | Miles |
| Travis Van Winkle | ... | Trent |
| Peter Jacobson | ... | Mr. Hosney |
| Glenn Morshower | ... | SOCCENT Colonel Sharp (as Glen Morshower) |
| Frederic Doss | ... | SOCCENT Op-Centre Tech (as Lt. Frederic Doss) |
| Charlie Bodin | ... | SOCCENT Op-Centre Tech |
| Joshua Feinman | ... | USAF Staff Sergeant (as Josh Feinman) |
| Chris Ellis | ... | Admiral Brigham |
| Steven Ford | ... | Four Star General |
| Michael Shamus Wiles | ... | Two Star General |
| Craig Barnett | ... | Air Force Major General |
| Brian Prescott | ... | Keller Aide |
| Scott Peat | ... | Pentagon Watch Commander |
| Colleen Porch | ... | Enlisted Aide |
| Brian Stepanek | ... | Sector Seven Agent |
| Jamie McBride | ... | FBI Agent |
| Wiley M. Pickett | ... | FBI Agent (as Wiley Pickett) |
| Andy Milder | ... | R&D Team Leader |
| Brian Reece | ... | Moustache Man |
| Samantha Smith | ... | Sarah Lennox |
| Ravi Patel | ... | Telephone Operator |
| Rick Gomez | ... | Sheriff |
| Andy Domingues | ... | Deputy |
| Mike Fisher | ... | Football Coach |
| Colin Fickes | ... | Analyst |
| Tom Lenk | ... | Analyst |
| Jamison Yang | ... | Analyst |
| Esther Scott | ... | Glen's Grandmother |
| Madison Mason | ... | CNN Reporter |
| Jeremy Jojola | ... | News Reporter |
| Jessica Kartalija | ... | News Reporter |
| Andrew Altonji | ... | Cafe Kid |
| Andrew Caldwell | ... | Cafe Kid |
| J.P. Manoux | ... | Witness |
| Pete Gardner | ... | Dad |
| Sophie Bobal | ... | Little Girl |
| Laurel Garner | ... | Mom in Car |
| Chip Hormess | ... | Boy in Car |
| Ray Toth | ... | Pilot |
| Michael Adams | ... | AWACS Controller |
| Ron Henry | ... | AWACS Controller |
| Benjamin Hoffman | ... | AWACS Controller |
| Michael McNabb | ... | AWACS Controller |
| Jason White | ... | AWACS Controller (as Jason T. White) |
| Adam Ratajczak | ... | Control Tower Tech |
| Maya Klayn | ... | Socialite |
| Michelle Pierce | ... | Socialite |
| Odette Yustman | ... | Socialite |
| Bob Stephenson | ... | Xbox Guy |
| Mason Rock Bay | ... | Himself (as Mason the Mastiff) |
| Peter Cullen | ... | Optimus Prime (voice) |
| Mark Ryan | ... | Bumblebee (voice) |
| Darius McCrary | ... | Jazz (voice) |
| Robert Foxworth | ... | Ratchet (voice) |
| Jess Harnell | ... | Ironhide / Barricade (voice) |
| Hugo Weaving | ... | Megatron (voice) |
| Jimmie Wood | ... | Bonecrusher (voice) (as Jim Wood) |
| Reno Wilson | ... | Frenzy (voice) |
| Charles Adler | ... | Starscream (voice) (as Charlie Adler) |
| rest of cast listed alphabetically: |
| Mike Allen | ... | Man on Corner (uncredited) |
| Mark Bedell | ... | Strike Team Soldier (uncredited) |
| Paul Michael Bloodgood | ... | Arctic Explorer (uncredited) |
| Tom Everett | ... | National Deputy Directory of Operations (uncredited) |
| Michael J. Fisher | ... | Football Coach (uncredited) |
| Sean Hampton | ... | USMC Private (uncredited) |
| Colton Haynes | ... | Cafe Kid (uncredited) |
| Nicole Randall Johnson | ... | ASI Security Woman (uncredited) |
| Aaron Michael Lacey | ... | SWAT Cop (uncredited) |
| Joel Lambert | ... | Sector 7 commando (uncredited) |
| Sebastian Lionell | ... | Soldier (uncredited) |
| J. Matthew Miller | ... | Reporter (uncredited) |
| Omar Benson Miller | ... | Glen's cousin (uncredited) |
| Seth Miller | ... | SWAT team member (uncredited) |
| Ron Mitchell | ... | Car Lot Security Guard (uncredited) |
| Stuart G Murphy | ... | SWAT Team (uncredited) |
| Matt Noble | ... | Bald Ranger Team Member (uncredited) |
| Geoffrey M. Reeves | ... | Secret Service Agent (uncredited) |
| Tavia Schwartz | ... | Pedestrian (uncredited) |
| Sean Smith | ... | Scientist (uncredited) |
| Ronnie Sperling | ... | Lead Scientist (uncredited) |
| Arne Starr | ... | Mission City Runner (uncredited) |
| James D. Weston II | ... | Pentagon Ops Officer (uncredited)
|
