Pinebrook is an unincorporated community and census-designated place (CDP) in Grimes County, Texas, United States. As of the 2020 census, Pinebrook had a population of 485. It was first listed as a CDP prior to the 2020 census.
The CDP is in the southeastern part of the county, southwest of Plantersville and southeast of Navasota. An extension of the Aggie Expressway (Texas State Highway 249) is slated to pass just south of the community. The highway leads southeast to Interstate 45 at Aldine, north of Houston.
Pinebrook first appeared as a census designated place in the 2020 U.S. census.
It is within Navasota Independent School District, which operates Navasota High School.