The Union Pacific is the largest rail system in the United States. The rail system is owned by the Union Pacific Railroad, a Class I railroad owned by the Union Pacific Corporation.

Union Pacific may also refer to:

• Union Pacific ^[ru], a 1934 ballet by Nicolas Nabokov and Léonide Massine, Ballet Russe de Monte-Carlo
• Union Pacific (film), a 1939 film directed by Cecil B. DeMille and starring Barbara Stanwyck and Joel McCrea
• Union Pacific (TV series), a Western television series
• Union Pacific (board game), a board game by Alan R. Moon, third place for the Deutscher Spiele Preis
• Union Pacific (restaurant), an American restaurant based in New York City

• Pacific Union

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