Cross Mountain is a census-designated place (CDP) in Bexar County, Texas, United States.

It is bordered by the city of San Antonio to the east and the CDP of Scenic Oaks to the north.

According to the United States Census Bureau, the CDP has a total area of 6.7 square miles (17.4 km2), all land.

[15] As of the 2020 United States census, there were 3,944 people, 909 households, and 812 families residing in the CDP.

Cross Mountain is served by the Northside Independent School District.