Holladay is a city in central Salt Lake County, Utah, United States. It is part of the Salt Lake City, Utah Metropolitan Statistical Area and abuts the Wasatch National Forest. The population was 31,965 at the 2020 census, a significant increase from 14,561 in 2000 when the first area incorporated from Salt Lake County. The city was incorporated on November 29, 1999, as Holladay-Cottonwood, and the name was shortened to Holladay on December 14 of that year. It was reported in the 1990 census as the Holladay-Cottonwood CDP.

The Salt Lake City metropolitan area is the metropolitan area centered on the city of Salt Lake City, Utah. The Office of Management and Budget and the United States Census Bureau currently define the Salt Lake City, Utah Metropolitan Statistical Area as comprising two counties: Salt Lake and Tooele. As of the 2020 census, the MSA had a population of 1,257,936. The Salt Lake City Metropolitan Area and the Ogden-Clearfield Metropolitan Area were a single metropolitan area known as the Salt Lake City-Ogden Metropolitan Area until being separated in 2005.