DeSoto Parish is a parish located in the U.S. state of Louisiana. The parish was formed in 1843. At the 2020 U.S. census, the population was 26,812. Its parish seat is Mansfield. DeSoto Parish is part of the Shreveport–Bossier City metropolitan statistical area.

The Shreveport–Bossier City metropolitan area, officially designated Shreveport–Bossier City by the U.S. Office of Management and Budget, or simply Greater Shreveport, is a metropolitan statistical area in northwestern Louisiana that covers three parishes: Caddo, Bossier, and DeSoto. At the 2020 United States census, the metropolitan region had a population of 393,406; its American Community Survey population was 397,590 per census estimates. With a 2010 census population of 439,000, it declined to become Louisiana's fourth largest metropolis at 394,706 residents at the 2019 census estimates.