Atascosa (/ˌætəsˈkoʊsə/ AT-əs-KOH-sə) is an unincorporated community located in southwestern Bexar County, Texas, United States.

The community's name means "boggy" in Spanish and was first settled sometime after the American Civil War.

In 1885, the community had a Baptist church, a general store, a saloon, two blacksmiths, and a population of 180.

McNair Middle School and Elm Creek Elementary are located in Atascosa off Old Pearsall Road.

Many people in the area raise cattle, horses, goats, pigs, peacocks, and other poultry.