The John M. Wynne Unit is a men's prison of the Texas Department of Criminal Justice, located in northern Huntsville, Texas, at the intersection of Farm to Market Road 2821 West and Texas State Highway 75 North. The Windham School District has its headquarters in the unit. Wynne, the second oldest prison in Texas, was named after John Magruder Wynne, who served as a prison employee and later as a board member of the prison system from 1878 to 1881.