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| Title | Director | Cast | Genre | Notes |
|---|---|---|---|---|
| Key Largo | John Huston | Humphrey Bogart, Lauren Bacall, Edward G. Robinson, Lionel Barrymore, Claire Trevor | Crime drama | Warner Bros. |
| Kiss the Blood Off My Hands | Norman Foster | Joan Fontaine, Burt Lancaster | Film noir | Universal Pictures |
| Kitty Foiled | Hanna Barbera | Animated short | MGM | |
| Ladies of the Chorus | Phil Karlson | Marilyn Monroe | Musical | Columbia Pictures |
| Last of the Wild Horses | Robert L. Lippert | James Ellison, Mary Beth Hughes | Western | Screen Guild |
| Letter from an Unknown Woman | Max Ophüls | Joan Fontaine, Louis Jourdan | Drama | |
| The Little Orphan | Hanna Barbera | Animated short | MGM | |
| Louisiana Story | Robert J. Flaherty | Documentary | ||
| The Loves of Carmen | Charles Vidor | Rita Hayworth, Glenn Ford | Drama | Columbia Pictures |
| The Luck of the Irish | Henry Koster | Tyrone Power, Anne Baxter, Lee J. Cobb | Fantasy | |
| Macbeth | Orson Welles | Orson Welles, Jeanette Nolan, Dan O'Herlihy | Drama | Republic Pictures |
| The Man from Colorado | Henry Levin | William Holden, Glenn Ford | Western | Columbia Pictures |
| Melody Time | Jack Kinney, Clyde Geronimi | Animated short | Walt Disney | |
| Mexican Hayride | Charles Barton | Abbott and Costello | Musical | Universal Pictures |
| Mickey | Ralph Murphy | Irene Hervey, Hattie McDaniel | Drama | |
| Moonrise | Frank Borzage | Gail Russell, Dane Clark | Film noir | Republic Pictures |
| Mouse Cleaning | Hanna Barbera | Animated short | MGM | |
| Mr. Blandings Builds His Dream House | H.C. Potter | Cary Grant, Myrna Loy | Comedy | RKO Pictures |
| My Bunny Lies Over The Sea | Charles M. Jones | Animated short | Warner Bros. |
Read more about this topic: List Of American Films Of 1948