Flat Top Mountain is a large area of high ground in southern West Virginia, touching five different counties (Mercer, Raleigh, Summers, Wyoming, and McDowell). It sits on the edge of the Allegheny Plateau. The summit is a unique, flat tableland covering about 40 square miles and rising above 3,000 feet. The highest point is Huff Knob at 3,560 feet.

This flat surface was preserved by very hard Guyandotte sandstone that resisted erosion, which is why the mountain looks like a flat-topped table. Underneath are rich deposits of Pocahontas coal. Starting in the 1880s, the mountain became a huge mining area, with over 150 mines and thousands of coke ovens operating near the turn of the 20th century.

Historically, Flat Top was a remote and hard-to-reach area. During the Civil War, military lines extended across the mountain. Today, the mountain is crossed by the West Virginia Turnpike (I-77) (pictured from crest looking south).

Flat Top Mountain is now a major recreational area, home to attractions like the Winterplace Ski Resort, Glade Springs Resort, and Camp Creek State Park. The area is also known for Christmas tree farming.