O-R
| Title | Director | Cast | Genre | Notes |
|---|---|---|---|---|
| Of Fox and Hounds | Tex Avery | Willoughby the Dog | Animated Short | |
| One Million B.C. | Hal Roach, Jr., Hal Roach | Victor Mature, Carole Landis, Lon Chaney, Jr. | Fantasy | Nominated for 2 Academy Awards. |
| One Night in the Tropics | A. Edward Sutherland | Abbott and Costello | Comedy | |
| Our Town | Sam Wood | William Holden, Martha Scott, Fay Bainter | Drama | Nominated for 6 Academy Awards. |
| Patient Porky | Bob Clampett | Porky the Pig | Animated Short | |
| The Philadelphia Story | George Cukor | Cary Grant, Katharine Hepburn, James Stewart | Screwball comedy | Won 2 Academy Awards, one for Best Actor; another 4 nominations. Footage preserved in US National Registry. #6 in Top Grossing Films. |
| Pinocchio | T. Hee, Wilfred Jackson, Jack Kinney | Animated | Won 2 Academy Awards. Footage preserved in US National Registry. #2 in Top Grossing Films*. | |
| Pride and Prejudice | Robert Z. Leonard | Greer Garson, Laurence Olivier, Edward Ashley | Drama | Won Academy Award. #20 in Top Grossing Films. |
| Primrose Path | Gregory La Cava | Ginger Rogers, Joel McCrea, Marjorie Rambeau | Drama | Nominated for Academy Award. |
| Private Affairs | Albert S. Rogell | Nancy Kelly | Comedy | |
| Puss Gets the Boot | Hanna Barbera, William Hanna, Rudolf Ising | Lillian Randolph | Animated Short | Nominated for Academy Award. |
| Queen of the Yukon | Phil Rosen | Charles Bickford, Irene Rich, June Carlson | Adventure Western | |
| Quicker'n a Wink | George Sidney | Clarence Curtis, Harold E. Edgerton, Tex Harris | Short Documentary | Won Academy Award. |
| Rebecca | Alfred Hitchcock | Laurence Olivier, Joan Fontaine | Psychological thriller | Won 2 Academy Awards, one for Best Picture; another 9 nominations. #3 in Top Grossing Films. |
| Remember the Night | Mitchell Leisen | Barbara Stanwyck, Fred MacMurray | Romantic Drama | |
| The Return of Frank James | Fritz Lang | Henry Fonda | Western | |
| Rhythm on the River | Victor Schertzinger | Bing Crosby, Mary Martin, Basil Rathbone | Musical Comedy | Nominated for Academy Award. |
| Road to Singapore | Victor Schertzinger | Bob Hope, Bing Crosby | Musical comedy | |
| Rockin' Thru the Rockies | Jules White | The Three Stooges | Comedy Short |
Read more about this topic: List Of American Films Of 1940