| Title |
Director |
Cast |
Genre |
Notes |
| If I'm Lucky | Lewis Seiler | Vivian Blaine, Perry Como | Musical | |
| It's a Wonderful Life | Frank Capra | James Stewart, Donna Reed, Lionel Barrymore | Fantasy | RKO; nominated for 5 Academy Awards |
| It Shouldn't Happen to a Dog | Herbert I. Leeds | Carole Landis | Comedy | 20th Century Fox |
| The James Brothers of Missouri | Fred C. Brannon | Keith Richards, Noel Neill | Western | Republic; on Jesse James |
| Janie Gets Married | Vincent Sherman | Joan Leslie, Ann Harding | Comedy | sequel to 1944 film |
| The Jolson Story | Alfred E. Green | Larry Parks, William Demarest | Biography | Columbia; on Al Jolson |
| Just Before Dawn | William Castle | Warner Baxter | Mystery | |
| The Kid from Brooklyn | Norman Z. McLeod | Danny Kaye, Virginia Mayo, Vera-Ellen | Comedy | remake of The Milky Way |
| The Killers | Robert Siodmak | Ava Gardner, Burt Lancaster, Edmond O'Brien | Film noir | Universal |
| King of the Forest Rangers | Spencer Gordon Bennet | Larry Thompson | Serial | RKO |
| Kitty Kornered | Robert Clampett | | Animated | Warner Bros. |
| Lady Luck | Edwin L. Marin | Robert Young, Barbara Hale | Comedy | RKO |
| Little Giant | William A. Seiter | Abbott and Costello | Comedy | Universal |
| The Locket | John Brahm | Laraine Day, Brian Aherne, Robert Mitchum | Film noir | RKO |
| Lost City of the Jungle | | Russell Hayden | Serial | Universal |
| Make Mine Music | Jack Kinney, Clyde Geronimi | Dinah Shore, Benny Goodman, The Andrews Sisters | Animated film | Disney |
| The Man Who Dared | John Sturges | George Macready, Forrest Tucker | Drama | Columbia |
| The Milky Waif | Hanna-Barbera | Tom and Jerry | Animated | MGM |
| Miss Susie Slagle's | John Berry | Veronica Lake, Sonny Tufts, Lillian Gish | Romance | Paramount |
| Monkey Businessmen | Edward Bernds | Three Stooges | Short subject | Columbia |
| Mr. Ace | Edwin L. Marin | George Raft, Sylvia Sydney | Crime | United Artists |
| Murder in the Music Hall | John English | Nancy Kelly, Vera Ralston | Musical | |
| My Darling Clementine | John Ford | Henry Fonda, Victor Mature, Walter Brennan, Linda Darnell, Ward Bond | Western | Fox; on Wyatt Earp |
| My Reputation | Curtis Bernhardt | Barbara Stanwyck, George Brent | Romance | Warner Bros. |
| The Mysterious Mr. M | Lewis Collins, V. Keays | | Serial | Universal |
| The Mysterious Mr. Valentine | Philip Ford | William Henry, Linda Stirling, Virginia Christine | Film noir | Republic |
| Night and Day | Michael Curtiz | Cary Grant, Alexis Smith, Jane Wyman | Musical, Biography | Warner Bros.; on Cole Porter |
| Night Editor | Henry Levin | William Gargan, Janis Carter | Film noir | Columbia |
| A Night in Casablanca | Archie Mayo | Marx Brothers, Sig Ruman | Comedy | United Artists |
| Night in Paradise | Arthur Lubin | Merle Oberon, Turhan Bey, Gale Sondergaard | Comedy, Drama | Universal |
| Nobody Lives Forever | Jean Negulesco | John Garfield, Geraldine Fitzgerald | Film noir | Warner Bros. |
| Nocturne | Edwin L. Marin | George Raft, Lynn Bari, Virginia Huston | Film noir | RKO |
| No Leave, No Love | Charles Martin | Van Johnson, Patricia Kirkwood | Musical | MGM |
| Notorious | Alfred Hitchcock | Cary Grant, Ingrid Bergman, Claude Rains, Louis Calhern | Suspense | RKO; nominated for 2 Academy Awards |
| The Notorious Lone Wolf | D. Ross Lederman | Gerald Mohr, Janis Carter, Eric Blore | Adventure | Columbia |