Lewisville ( LOO-iss-vil) is a city in the U.S. state of Texas, located in Denton County with portions extending into Dallas County. As one of the Mid-Cities within the Dallas–Fort Worth metroplex, the 2020 census reported a population of 111,822.

Originally called Holford's Prairie, Lewisville dates back to the early 1840s. The arrival of the town's first railroad in 1881 engendered its initial growth, and the expansion of the area's transportation infrastructure spurred further development in the early part of the 20th century. Lewisville incorporated in 1925, and when construction of Lewisville Lake was completed in the 1950s, the city began to expand rapidly.

Lewisville's proximity to Lewisville Lake has made it a recreational hub of the Dallas–Fort Worth metroplex. The area's transportation infrastructure has evolved around the I-35 Corridor along Interstate 35E. The diversity of its population and industry such as multiple landfills, has created a stable economic climate. Lewisville Independent School District provides most of the area's public education programs.