Hillje (pronounced "Hill-Gee") is an unincorporated community in Wharton County, Texas, United States.

The community was named for Fred Hillje, who purchased part of a local ranch in 1888.

The New York, Texas and Mexican Railway had a railroad siding called the 45-mile post, which is where Hillje was laid out.

There were five businesses in the community in 1931, as well as a factory, two churches, and a cemetery on the 1936 county highway map.

The district's campuses are located in Louise, a few miles west of Hillje on U.S. Highway 59 (US 59).