DeSoto is a city in Dallas County, Texas, United States. DeSoto is a suburb of Dallas and is part of the Best Southwest area, which includes DeSoto, Cedar Hill, Duncanville, and Lancaster.

Dallas County is the second-most populous county in the U.S. state of Texas with a 2020 U.S. census of 2,613,539, making it the ninth-most populous county in the country. Dallas County is included in the Dallas-Arlington-Fort Worth metropolitan statistical area—colloquially referred to as the Dallas–Fort Worth metroplex. Municipal expansion within Dallas County has blurred the geographic lines between cities and between neighboring counties.