The Houston Independent School District (HISD) is the largest public school system in Texas, and the eighth-largest in the United States. Houston ISD serves as a community school district for most of the city of Houston and several nearby and insular municipalities in addition to some unincorporated areas. Like most districts in Texas, it is independent of the city of Houston and all other municipal and county jurisdictions. The district has its headquarters in the Hattie Mae White Educational Support Center in Houston.

An independent school district (ISD) is a type of school district in some US states for primary and secondary education that operates as an entity independent and separate from any municipality or county, and only under the oversight of the respective state government. As such, the administrative leadership of such districts is selected from within the district itself and has no direct responsibility to any other governmental authority. This independence normally also implies that the district has its own taxing authority that is outside the direct control of other governmental entities.