Franklin Forge 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 eastern Blair County, in the northwestern part of Woodbury Township. It is bordered to the northwest by Piney Creek, just upstream from the creek's confluence with the Frankstown Branch Juniata River at Ganister. Wertz Road forms the northern boundary of the CDP, and Krajacic Lane is the western boundary. The community is west of Williamsburg and by road northeast of Hollidaysburg.
It is in the Williamsburg Community School District.