Brigham City is a city in Box Elder County, Utah, United States. The population was 19,650 at the 2020 census, up from the 2010 figure of 17,899. It is the county seat of Box Elder County. It lies on the western slope of the Wellsville Mountains, a branch of the Wasatch Range at the western terminus of Box Elder Canyon. Brigham City saw most of its growth during the 1950s and 1960s but has seen a struggling economy and stagnating growth. It is near the former headquarters of ATK Thiokol, now Northrop Grumman, the company that created the solid rocket boosters for the Space Shuttle.

Brigham City is known for its peaches and holds an annual celebration called Peach Days on the weekend after Labor Day. Much of Main Street is closed off to cars, and the festival is celebrated by a parade, a car show, a carnival, and other activities. The Church of Jesus Christ of Latter-day Saints (LDS Church) dedicated its fourteenth temple in Utah in Brigham City on September 23, 2012.

The city is the headquarters of the Northwestern Band of the Shoshone Nation, a federally recognized tribe of Shoshone people.