Sylvan Hills is a census-designated place (CDP) in Blair County, Pennsylvania, United States. It was first listed as a CDP prior to the 2020 census.

The CDP is in central Blair County, in the northwest part of Frankstown Township. It is bordered to the south by the borough of Hollidaysburg, the county seat, and it is 5 miles (8 km) south of Altoona, the largest city in the county.