| Titre | Réalisateur | Distribution | Genre | Notes | 
| I Accuse My Parents | Sam Newfield | Mary Beth Hughes | Film policier, drame |  | 
| Idle Roomers | Del Lord | Les Trois Stooges | Comédie, court métrage | Columbia Pictures | 
| I'll Be Seeing You | William Dieterle | Ginger Rogers, Shirley Temple | Drame | Selznick International Pictures | 
| In Our Time | Vincent Sherman | Ida Lupino, Paul Henreid | Film d'amour | Warner Bros. | 
| In Society | Jean Yarbrough | Abbott et Costello | Comédie | Universal Pictures | 
| The Invisible Man's Revenge | Ford Beebe | Jon Hall, John Carradine | Science fiction, Film d'horreur | Universal Pictures | 
| It Happened Tomorrow | René Clair | Dick Powell, Linda Darnell | Fantasy, Comédie | 2 nominations aux Academy Award | 
| Jammin' the Blues | Gjon Mili |  | Court métrage |  | 
| Jerry ne se laisse pas faire (Mouse Trouble) | Hanna-Barbera | Tom and Jerry | Dessin animé, court métrage | MGM | 
| The Keys of the Kingdom | John M. Stahl | Gregory Peck, Thomas Mitchell, Roddy McDowall | Drame | 20th Century Fox | 
| Kismet | William Dieterle | Ronald Colman, Marlene Dietrich, James Craig | Film historique | MGM | 
| The Lady and the Monster | George Sherman | Vera Ralston | Science fiction, Film d'horreur | Republic Pictures | 
| Lady in the Dark | Kurt Weill | Ginger Rogers, Ray Milland | Film musical |  | 
| Invitation Ă  la danse | Frank Woodruff | Belita | Film musical | Monogram Pictures | 
| Laura | Otto Preminger | Gene Tierney, Dana Andrews, Clifton Webb, Vincent Price, Judith Anderson | Film noir | d'après le roman de Vera Caspary | 
| Lifeboat | Alfred Hitchcock | Tallulah Bankhead, William Bendix | Film de guerre, drame | Meilleur scénario aux Oscars | 
| Little Red Riding Rabbit | Friz Freleng |  | Dessin animé, court métrage | Warner Bros. | 
| The Lodger | John Brahm | Merle Oberon, George Sanders, Laird Cregar | Film d'horreur | 20th Century Fox | 
| Lost in a Harem | Charles Reisner | Abbott et Costello | Comédie | MGM | 
| Man from Frisco | Robert Florey | Michael O'Shea, Anne Shirley | Espionnage | Republic | 
| The Mask of Dimitrios | Jean Negulesco | Sydney Greenstreet, Peter Lorre | Film noir | d'après le roman d'Eric Ambler | 
| Meet me in Saint Louis | Vincente Minnelli | Judy Garland, Margaret O'Brien, Mary Astor | Film musical | 4 nominations aux Oscar | 
| Meet the People | Charles Reisner | Lucille Ball, Dick Powell | Film musical | Metro-Goldwyn-Mayer | 
| Memphis Belle: A Story of a Flying Fortress | William Wyler |  | Documentaire | Paramount Pictures | 
| The Million Dollar Cat | William Hanna, Joseph Barbera |  | Dessin animé, court métrage | MGM | 
| Ministry of Fear | Fritz Lang | Ray Milland | Film noir | Paramount Pictures | 
| The Miracle of Morgan's Creek | Preston Sturges | Eddie Bracken, Betty Hutton, William Demarest | Comédie | Paramount Pictures | 
| The Monster Maker | Sam Newfield | J. Carrol Naish | Science fiction |  | 
| Mr. Skeffington | Vincent Sherman | Bette Davis, Claude Rains | Drame | Warner Bros. | 
| Mrs. Parkington | Tay Garnett | Greer Garson, Walter Pidgeon, Edward Arnold | Drame |  | 
| The Mummy's Curse | Leslie Goodwins | Lon Chaney | Film d'horreur | Universal Pictures | 
| The Mummy's Ghost | Reginald Le Borg | Lon Chaney, John Carradine | Film d'horreur | Universal Pictures | 
| Murder, My Sweet | Edward Dmytryk | Dick Powell, Claire Trevor | Film noir | RKO Pictures | 
| Mystery of the River Boat | Lewis D. Collins, Ray Taylor |  | Serial | Universal Pictures | 
| National Velvet | Clarence Brown | Mickey Rooney, Elizabeth Taylor | Drame | MGM; remporte 2 Oscars | 
| The Negro Soldier | Stuart Heisler |  | Film de guerre, propagande |  | 
| Nevada | Edward Killy | Robert Mitchum, Anne Jeffreys | Western | RKO Pictures | 
| No Dough Boys | Jules White | Les Trois Stooges | Comédie, court métrage | Columbia Pictures | 
| None But the Lonely Heart | Clifford Odets | Cary Grant, Ethel Barrymore | Drame | Oscar du meilleur acteur pour Barrymore | 
| None Shall Escape | André de Toth | Marsha Hunt, Henry Travers | Film de guerre, drame | Columbia Pictures | 
| Nothing But Trouble | Sam Taylor | Laurel et Hardy | Comédie | MGM | 
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