Lost Creek is an affluent upper-middle-class neighborhood and census-designated place (CDP) in Travis County, Texas, United States.

The census tract is bordered by Capital of Texas Highway to the east, Barton Creek to the south, Barton Creek Boulevard to the west, and Bee Caves Road to the north.

Lost Creek also encompasses a commercial area bordering Bee Caves Road and Capital of Texas Highway.

Businesses occupying these buildings include Capital One Bank, Wells Fargo Bank, and Apple Inc. Lost Creek was annexed by the City of Austin in December 2015 and was dis-annexed in May 2024[3] under the provisions of HB 3053 passed during the 88th Texas Legislature[4] Lost Creek has a total area of 3.3 square miles (8.5 km2), all land.

[5] Lost Creek lies completely within the Eanes Independent School District.

Adult residents of Lost Creek are extremely well educated.