Knob Mountain is a mountain in Page County, Virginia. It is part of the Blue Ridge Mountains. Its summit lies within Shenandoah National Park.
Geologically speaking, the mountain is situated in the northern subprovince of the Blue Ridge Province of the Appalachian Highlands. It is part of the Crystalline Appalachians. Knob Mountain is separated from parallel Neighbor Mountain to the east by a stream known as Jeremy's Run. To the west of Knob Mountain lies the Great Appalachian Valley.
Knob Mountain is accessible from the Knob Mountain Trail, which runs along much of the mountain's ridge. The closest scenic viewpoint along Skyline Drive from which to view Knob Mountain is Jeremy's Run Overlook.