| Title | Director | Cast | Genre | Studio/Notes |
| An Ache in Every Stake | Del Lord | The Three Stooges | Comedy short | |
| Adam Had Four Sons | Gregory Ratoff | Ingrid Bergman, Warner Baxter, Susan Hayward | Drama | Columbia |
| Adventures of Captain Marvel | William Witney, John English | Tom Tyler, Frank Coghlan, Jr. | Serial | Republic's first comic book adaptation |
| All the World's a Stooge | Del Lord | The Three Stooges | Comedy short | |
| All This and Rabbit Stew | Tex Avery | Bugs Bunny | Animation | |
| All Through the Night | Vincent Sherman | Humphrey Bogart, Kaaren Verne, Conrad Veidt, Jane Darwell | Mystery, comedy | Warner Bros. |
| Among the Living | Stuart Heisler | Albert Dekker, Susan Hayward, Harry Carey, Frances Farmer | Horror | Paramount |
| Andy Hardy's Private Secretary | George B. Seitz | Lewis Stone, Mickey Rooney, Kathryn Grayson | Family | MGM |
| The Art of Self Defense | Jack Kinney | Goofy | Animation | |
| Aviation Vacation | Tex Avery | Looney Tunes | Animation | |
| Babes on Broadway | Busby Berkeley | Judy Garland, Mickey Rooney | Musical | MGM; third in Berkeley's backyard musicals |
| Back Street | Robert Stevenson | Charles Boyer, Margaret Sullavan | Drama | Remake of the 1932 film |
| The Bad Man | Richard Thorpe | Wallace Beery, Lionel Barrymore, Laraine Day, Ronald Reagan | Western | Remake of 1930's The Bad Man |
| Bad Men of Missouri | Ray Enright | Jane Wyman, Dennis Morgan | Western | Warner Bros. |
| Ball of Fire | Howard Hawks | Gary Cooper, Barbara Stanwyck | Comedy | Re-made as a musical in 1948 |
| Barnacle Bill | Richard Thorpe | Wallace Beery, Marjorie Main | Comedy | MGM |
| The Big Store | Charles Reisner | Marx Brothers, Tony Martin | Comedy | Last of the Marx Brothers’ films with MGM |
| Billy the Kid | David Miller | Robert Taylor, Brian Donlevy | Western | Remake of 1930 film Billy the Kid |
| Birth of the Blues | Victor Schertzinger | Bing Crosby, Mary Martin | Musical | Paramount |
| The Black Cat | Albert S. Rogell | Basil Rathbone, Hugh Herbert, Broderick Crawford, Bela Lugosi | Horror | Based on the short story by Edgar Allan Poe |
| Blood and Sand | Rouben Mamoulian | Tyrone Power, Linda Darnell, Rita Hayworth, Alla Nazimova | Drama | Previously made in both 1922 and 1916 |
| The Blood of Jesus | Spencer Williams | Cathryn Caviness, Spencer Williams | Race | Alternately titled The Glory Road |
| Blossoms in the Dust | Mervyn LeRoy | Greer Garson, Walter Pidgeon, Felix Bressart | Drama | 4 Academy Award nominations |
| Blues in the Night | Anatole Litvak | Priscilla Lane, Betty Field | Musical | Features the song Blues in the Night |
| Bowery Blitzkrieg | Wallace Fox | The East Side Kids, Keye Luke, Warren Hull | Comedy, Crime | |
| The Bride Came C.O.D. | William Keighley | James Cagney, Bette Davis | Comedy | Warner Bros. |
| Broadway Limited | Gordon Douglas | Victor McLaglen, Patsy Kelly, ZaSu Pitts | Comedy | United Artists |
| Buck Privates | Arthur Lubin | Abbott and Costello | Comedy | Universal |
| Burma Convoy | Noel M. Smith | Charles Bickford, Evelyn Ankers | Drama | |