O-S
| Title | Director | Cast | Genre | Notes |
|---|---|---|---|---|
| Oath of Vengeance | Sam Newfield | Buster Crabbe, Al St. John | Western | PRC |
| The Old Grey Hare | Robert Clampett | Animated Short | MGM | |
| One Body Too Many | Frank McDonald | Bela Lugosi | Comedy | Paramount Pictures |
| Passage to Marseille | Michael Curtiz | Humphrey Bogart, Claude Rains, Sydney Greenstreet, Peter Lorre | War | Warner Bros. |
| The Pearl of Death | Roy William Neill | Basil Rathbone, Nigel Bruce | Crime | Sherlock Holmes |
| Phantom Lady | Robert Siodmak | Franchot Tone | Film noir | Universal Pictures |
| Pin Up Girl | William LeBaron | Betty Grable, Martha Raye | Musical | 20th Century Fox |
| Practically Yours | Mitchell Leisen | Claudette Colbert, Fred MacMurray | Comedy | Paramount Pictures |
| The Price of Rendova | War Propaganda | |||
| The Princess and the Pirate | David Butler | Bob Hope, Virginia Mayo, Walter Brennan | Comedy Adventure | RKO |
| The Purple Heart | Lewis Milestone | Dana Andrews, Richard Conte, Farley Granger | War | 20th Century Fox |
| Puttin' on the Dog | Hanna Barbera | Animated Short | MGM | |
| Raiders of Ghost City | Lewis D. Collins, Ray Taylor | Western Serial | Universal Pictures | |
| Rationing | Willis Goldbeck | Wallace Beery, Marjorie Main | Comedy | MGM |
| The Return of the Vampire | Lew Landers | Bela Lugosi, Nina Foch | Horror | Columbia Pictures |
| Return to Guam | Short War Propaganda | Produced by the U.S. Navy | ||
| Russian Rhapsody | Robert Clampett | Looney Tunes | Animated Short | Warner Bros. |
| The Scarlet Claw | Roy William Neill | Basil Rathbone, Nigel Bruce | Crime | Sherlock Holmes |
| Secrets of Scotland Yard | George Blair | Edgar Barrier, Stephanie Bachelor | Thriller | Republic Pictures |
| Sensations of 1945 | Andrew Stone | Eleanor Powell, Dennis O'Keefe | Musical Comedy | United Artists |
| The Seventh Cross | Fred Zinnemann | Spencer Tracy, Hume Cronyn | Drama, War | MGM |
| Show Business | Edwin L. Marin | Eddie Cantor, George Murphy, Joan Davis | Musical | |
| Since You Went Away | John Cromwell | Claudette Colbert, Jennifer Jones, Shirley Temple, Joseph Cotten | Romance | United Artists |
| Song of Russia | Gregory Ratoff | Robert Taylor, Susan Peters | War | MGM |
| Song of the Open Road | S. Sylvan Simon | Jane Powell | Musical Comedy | United Artists |
| The Spider Woman | Roy William Neill | Basil Rathbone, Nigel Bruce, Gale Sondergaard | Mystery | Sherlock Holmes |
| Stage Door Cartoon | Friz Freleng | Animated Short | Warner Bros. Merrie Melodies | |
| Storm Over Lisbon | George Sherman | Vera Ralston, Erich von Stroheim | Thriller | Republic Pictures |
| The Story of Dr. Wassell | Cecil B. DeMille | Gary Cooper, Laraine Day, Signe Hasso | War Drama | |
| Sunday Dinner for a Soldier | Lloyd Bacon | Anne Baxter, John Hodiak | Romance | |
| The Suspect | Robert Siodmak | Charles Laughton, Ella Raines | Film noir | Universal |
Read more about this topic: List Of American Films Of 1944