Union Pacific is a 1939 American Western drama directed by Cecil B. DeMille and starring Barbara Stanwyck, Joel McCrea and Robert Preston.

Based on the 1936 novel Trouble Shooter by Western fiction author Ernest Haycox, the film is about the building of the eponymous railroad across the American West.

Despite precautionary measures, the locomotive suffered damage to its cab, running board, boiler jacketing, and pipework during the process of placing it on its side, and further as it was re-railed after filming concluded.

The films were: Goodbye, Mr. Chips, La piste du nord, Lenin in 1918, The Four Feathers, The Wizard of Oz, Union Pacific and Boefje.

Author Michael Coyne accordingly characterizes Union Pacific as a "technological nation-linking endeavor" in his book The Crowded Prairie: American National Identity In the Hollywood Western.

The premiere was the centerpiece of a four-day event that drew 250,000 people to the city, temporarily doubling its population and requiring the National Guard to help maintain order.

President Franklin Roosevelt inaugurated the overall celebration by pressing a telegraph key at the White House that opened the civic auditorium.

Union Pacific, along with The Sign of the Cross, Four Frightened People, Cleopatra and The Crusades, was released on DVD in 2006 by Universal Studios as part of the Cecil B. DeMille Collection.