Oak Hills is a census-designated place in Washington County, Oregon, United States. The population was 9,050 at the 2000 census. It is on unincorporated community land, but was assigned Beaverton mailing addresses by the U.S. Postal Service. It is managed by the Oak Hills Homeowners Association (OHHA).
The neighborhood is north of the Sunset Highway and is bounded by Cornell Road on the south, West Union Road on the north, Bethany Boulevard on the west and Northwest 143rd Avenue on the east. It was a planned community and was built in the 1960s. The first ten homes were completed in May 1965, the first of about 650 planned, in an area of approximately . Oak Hills today includes around 650 residences, of which 627 are single-family homes. The neighborhood is located at the western end of Cedar Mill and southeastern end of the Bethany area. Fire protection and EMS services are provided through Tualatin Valley Fire and Rescue.
The neighborhood was listed on the National Register of Historic Places on July 10, 2013, as the Oak Hills Historic District.