Lake Dunlap is a census-designated place in Guadalupe County, Texas, United States. The population was 1,934 at the 2010 census. It is part of the San Antonio–New Braunfels metropolitan area. The community is named after the former Lake Dunlap, a small reservoir on the Guadalupe River. In 2019, the dam failed, draining the lake. The repair was completed in August 2023, and the lake fully restored by the end of October that year.