Parnell Knob is a mountain in the Ridge and Valley Appalachians region of south central Pennsylvania. This knob rises above the village of St. Thomas, where Front Mountain and Broad mountain come together. It is a feature sculptured by the hard dense Tuscarora quartzite of the Silurian age. Parnell Knob is conspicuous in that it rises abruptly above the relatively level Great Appalachian Valley.

Parnell Knob
Parnell Knob
Highest point
Elevation	2,021 ft (616 m)
Geography
Location	Franklin County, Pennsylvania, U.S.
Parent range	Appalachian Mountains
Topo map	USGS Saint Thomas(PA) Quadrangle