| Fay Wray | Ann Darrow |
| Robert Armstrong | Carl Denham |
| Bruce Cabot | John Driscoll |
| Frank Reicher | Captain Englehorn |
| Sam Hardy | Charles Weston |
| Noble Johnson | Native Chief |
| Steve Clemente | Witch King (as Steve Clemento) |
| James Flavin | Second Mate Briggs |
| King Kong | King Kong |
| Walter Ackerman | Reporter (uncredited) |
| James Adamson | Native Child (uncredited) |
| Van Alder | Member of Ship's Crew (uncredited) |
| Ed Allen | Native (uncredited) |
| Etta Mae Allen | Native (uncredited) |
| Frank Angel | Reporter (uncredited) |
| Roscoe Ates | Press Photographer (uncredited) |
| Ralph Bard | Member of Ship's Crew (uncredited) |
| Reginald Barlow | Ship's Engineer (uncredited) |
| Leo Beard | Member of Ship's Crew (uncredited) |
| Fred Behrle | Member of Ship's Crew (uncredited) |
| Jack Best | Warrior (uncredited) |
| Johnnie Bland | Warrior (uncredited) |
| Eddie Boland | Reporter / Cameraman (uncredited) |
| Harry Bowen | Reporter (uncredited) |
| John Brakins | Warrior (uncredited) |
| Lynton Brent | Reporter / Cameraman (uncredited) |
| Roy Brent | Member of Ship's Crew (uncredited) |
| Everett Brown | Native in Ape Costume (uncredited) |
| Betty Burns | New York Theatergoer (uncredited) |
| Barney Capehart | Pilot (uncredited) |
| Jack Chapin | Reporter (uncredited) |
| Harry Claremont | Member of Ship's Crew (uncredited) |
| Edward Clark | Member of Ship's Crew (uncredited) |
| John Collins | Member of Ship's Crew (uncredited) |
| Odel Conley | Warrior (uncredited) |
| Onest Conley | Warrior (uncredited) |
| Merian C. Cooper | Pilot of Plane That Kills Kong (uncredited) |
| Harry Cornbleth | Member of Ship's Crew (uncredited) |
| Kathryn Curry | Native (uncredited) |
| Nathan Curry | Native (uncredited) |
| Dick Curtis | Member of Ship's Crew (uncredited) |
| Bill Dagwell | Member of Ship's Crew (uncredited) |
| George Daly | Machine Gunner (uncredited) |
| Ruby Dandridge | Native Dancer (uncredited) |
| Vivian Dandridge | Native Child (uncredited) |
| John Davis | Warrior (uncredited) |
| Joe Dill | Member of Ship's Crew (uncredited) |
| James Dime | Member of Ship's Crew (uncredited) |
| Fanny Donahue | Native (uncredited) |
| Jean Doran | New York Theatergoer (uncredited) |
| Walter Downing | New York Theatergoer (uncredited) |
| Florence Dudley | New York Theatergoer (uncredited) |
| Tex Duffy | Member of Ship's Crew (uncredited) |
| William Dunn | Native (uncredited) |
| William Duran | Warrior (uncredited) |
| Peter Duray | Reporter (uncredited) |
| Harry Duval | New York Theatergoer (uncredited) |
| Earl Dwire | New York Theatregoer (uncredited) |
| Ralph Easton | Reporter (uncredited) |
| Oliver Eckhardt | New York Theatregoer (uncredited) |
| Louise Emmons | Old Woman in Line at Mission (uncredited) |
| Shorty English | Member of Ship's Crew (uncredited) |
| Frank Fanning | Police Officer (uncredited) |
| Jean Fenwick | New Yorker (uncredited) |
| Bill Fisher | Member of Ship's Crew (uncredited) |
| Larry Fisher | Member of Ship's Crew (uncredited) |
| Art Flavin | Member of Ship's Crew (uncredited) |
| Joe Flourney | Native (uncredited) |
| Betty Gale | New Yorker (uncredited) |
| Jack Gallagher | Member of Ship's Crew (uncredited) |
| Bob Galloway | Pilot (uncredited) |
| Evelyn Garrison | Native (uncredited) |
| Harold Garrison | Native Child (uncredited) |
| Frank Gerritty | Member of Ship's Crew (uncredited) |
| June Gittelson | Fat Woman (uncredited) |
| Arnold Gray | Reporter (uncredited) |
| Duke Green | Member of Ship's Crew (uncredited) |
| Lawrence Green | Native (uncredited) |
| Dorothy Gulliver | New York Theatergoer (uncredited) |
| Charles Haefeli | Member of Ship's Crew (uncredited) |
| Charlie Hall | Member of Ship's Crew (uncredited) |
| Pat Harmon | Gunman (uncredited) |
| James Harrison | Cameraman (uncredited) |
| Eddie Hart | Reporter (uncredited) |
| Lew Harvey | Gunman (uncredited) |
| Etta Mae Henry | Native (uncredited) |
| Irene Henry | Baby (uncredited) |
| Tex Higginson | Member of Ship's Crew / Assistant Director / Taxi Driver (uncredited) |
| Earl 'Hap' Hogan | Member of Ship's Crew (uncredited) |
| Wesley Hopper | Reporter (uncredited) |
| Hazel Howell | New Yorker (uncredited) |
| Clifford Ingram | Warrior (uncredited) |
| T.C. Jack | Member of Ship's Crew (uncredited) |
| Jimmy James | Member of Ship's Crew / Assistant Director (uncredited) |
| Annie L. Johnson | Native (uncredited) |
| John L. Johnson | New York Theatergoer (uncredited) |
| Harry Keaton | Ballyhooer (uncredited) |
| Walter Kimpton | Member of Ship's Crew (uncredited) |
| Walter Kirby | Member of Ship's Crew (uncredited) |
| Al Knight | Warrior (uncredited) |
| Walter Knox | Native (uncredited) |
| Ethan Laidlaw | First Mate (uncredited) |
| Sam Levine | Member of Ship's Crew (uncredited) |
| Vera Lewis | New York Theatregoer (uncredited) |
| Timothy J. Lonergan | Police Officer / Usher (uncredited) |
| George MacQuarrie | Police Captain (uncredited) |
| George Magrill | Member of Ship's Crew (uncredited) |
| Joe Smith Marba | Elevated Train Motorman (uncredited) |
| Rena Marlowe | Native Child (uncredited) |
| Sam Marlowe | Warrior (uncredited) |
| Mae Marrin | Ballyhooer (uncredited) |
| Henry Martin | Warrior (uncredited) |
| Buddy Mason | Member of Ship's Crew (uncredited) |
| LeRoy Mason | New York Theatregoer (uncredited) |
| Richie McCarew | Member of Ship's Crew (uncredited) |
| Etta McDaniel | Native (uncredited) |
| Al McDonald | Member of Ship's Crew (uncredited) |
| Larry McGrath | Ballyhooer (uncredited) |
| Frank Meredith | Police Officer (uncredited) |
| Frank Mills | Reporter (uncredited) |
| Dusty Mitchell | Pilot (uncredited) |
| King Mojave | Ballyhooer (uncredited) |
| Carlotta Monti | New York Theatergoer (uncredited) |
| Harry Mount | Reporter (uncredited) |
| Almeta Muse | Native (uncredited) |
| Alice Nichols | Native (uncredited) |
| Nim Nixon | Native Dancer (uncredited) |
| John Northpole | Member of Ship's Crew (uncredited) |
| Skeets Noyes | Member of Ship's Crew (uncredited) |
| G. Raymond Nye | Police Captain (uncredited) |
| Frank O'Connor | Reporter (uncredited) |
| Paddy O'Flynn | Reporter / Cameraman (uncredited) |
| Tom O'Grady | New York Theatergoer (uncredited) |
| Bert O'Malley | Member of Ship's Crew (uncredited) |
| Charles O'Malley | Reporter (uncredited) |
| Edward Patrick | Native Dancer (uncredited) |
| Gil Perkins | Sailor (uncredited) |
| Jack Perry | Member of Ship's Crew (uncredited) |
| Nathan Perry | Native (uncredited) |
| Lee Phelps | Cameraman (uncredited) |
| Allen Pomeroy | Motorcycle Policeman (uncredited) |
| Paul Porcasi | Apple Vendor (uncredited) |
| Mahlon Potts | Native Child (uncredited) |
| Malcon Potts | Native Child (uncredited) |
| Russ Powell | Watchman (uncredited) |
| A.J. Prather | Native (uncredited) |
| Jack Pratt | Radio Announcer (uncredited) |
| Tom Quinn | Reporter (uncredited) |
| T.J. Rankin | Native Dancer (uncredited) |
| Eddy Reed | Reporter (uncredited) |
| Gus Robinson | Native Dancer (uncredited) |
| Ed Rochelle | Reporter (uncredited) |
| Russ Rogers | Pilot (uncredited) |
| Jack Saunders | Member of Ship's Crew (uncredited) |
| Russell Saunders | Reporter (uncredited) |
| Syd Saylor | Reporter (uncredited) |
| Ernest B. Schoedsack | Machine-Gunner on Plane That Kills Kong (uncredited) |
| Charles Sewell | Member of Ship's Crew (uncredited) |
| Floyd Shackelford | Warrior (uncredited) |
| Sandra Shaw | Hotel Woman Dropped by Kong (uncredited) |
| Tony Shelly | Native (uncredited) |
| Gay Sheridan | New York Theatergoer (uncredited) |
| Milton Shockley | Warrior (uncredited) |
| Jack Silver | Member of Ship's Crew (uncredited) |
| Jack Smith | Reporter (uncredited) |
| William Solder | Native (uncredited) |
| Katherine Sparks | Native (uncredited) |
| Hugh Starkey | Member of Ship's Crew (uncredited) |
| Larry Steers | New York Theatregoer (uncredited) |
| Edward Stevens | Reporter (uncredited) |
| Roy Stewart | Reporter (uncredited) |
| Harry Strang | Policeman at Headquarters (uncredited) |
| Eddie Sturgis | Ballyhooer (uncredited) |
| Madame Sul-Te-Wan | Native (uncredited) |
| Charles Sullivan | Member of Ship's Crew (uncredited) |
| Gertrude Sutton | New York Theatergoer (uncredited) |
| Tobias Tally | Warrior (uncredited) |
| Walter Taylor | Member of Ship's Crew (uncredited) |
| Harry Tenbrook | Sailor (uncredited) |
| Ivan Thomas | Conductor (uncredited) |
| Roy Thompson | Warrior (uncredited) |
| Jim Thorpe | New York Theatergoer (uncredited) |
| Earl Turman | Warrior (uncredited) |
| Ray Turner | Native (uncredited) |
| William Van Vleck | Member of Ship's Crew (uncredited) |
| Monte Vandergrift | Police Officer (uncredited) |
| Sailor Vincent | Member of Ship's Crew (uncredited) |
| John Wade | Warrior (uncredited) |
| Kid Wagner | Member of Ship's Crew (uncredited) |
| Harry Walker | Member of Ship's Crew (uncredited) |
| Wade Walker | Native (uncredited) |
| H.R. Warwick | Member of Ship's Crew (uncredited) |
| Blue Washington | Warrior (uncredited) |
| Charles Washington | Warrior (uncredited) |
| George Washington | Warrior (uncredited) |
| Hannah Washington | Native Child (uncredited) |
| Jack West | Native (uncredited) |
| Blackie Whiteford | Member of Ship's Crew (uncredited) |
| Bill Williams | New York Theatergoer (uncredited) |
| Geneva Williams | Native (uncredited) |
| Ivory Williams | Warrior (uncredited) |
| Victor Wong | Charlie - Ship's Cook (uncredited) |
| Eric Wood | Pilot (uncredited) |
| Helen Worthington | New York Theatergoer (uncredited) |
| Lillian Young | New York Theatergoer (uncredited) |