K-L
| Title | Director | Cast | Genre | Notes |
|---|---|---|---|---|
| King of the Royal Mounted | William Witney, John English | Action Adventure Serial | ||
| Kitty Foyle | Sam Wood | Ginger Rogers, Dennis Morgan, James Craig | Drama | Won Academy Award for Best Actress; another 4 nominations. #10 in Top Grossing Films. |
| Knock Knock | Walter Lantz (producer) | Animated Short | ||
| Knute Rockne, All American | Lloyd Bacon | Pat O'Brien, Ronald Reagan | Biographical | Story of football coach Knute Rockne. |
| Lady with Red Hair | Curtis Bernhardt | Miriam Hopkins, Claude Rains, Richard Ainley | Drama | |
| The Letter | William Wyler | Bette Davis, Herbert Marshall, James Stephenson | Film noir | Nominated for 7 Academy Awards. |
| The Light That Failed | William Wellman | Ronald Colman, Walter Huston, Ida Lupino | Drama | |
| Lillian Russell | Irving Cummings | Alice Faye, Don Ameche, Henry Fonda | Biographical | Nominated for Academy Award. |
| A Little Bit of Heaven | Andrew Marton | Gloria Jean, Hugh Herbert, Robert Stack | Musical | Followup to The Under-Pup (1939 film). |
| Little Nellie Kelly | Norman Taurog | Judy Garland | Musical Comedy | |
| The Long Voyage Home | John Ford | John Wayne, Thomas Mitchell, Ian Hunter | War Drama | Nominated for 6 Academy Awards. |
Read more about this topic: List Of American Films Of 1940