Gilfillan Trail at Gilfillan Park, Upper St Clair, Pennsylvania is a 1.2 mile loop hike that surrounds the adjacent 15-acre Gilfillan Farm which was left to the Historical Society of Upper St. Clair in 2001.

The trail is relatively easy, but has a 140 foot ascent within the first 0.3 miles. It winds through woodlands of native trees such like white ash, American beech and sassafras - some of which are estimated to be over 400 years old.