Fort Spring is an unincorporated community and town in Greenbrier County, West Virginia, United States.

It was once a substantial portion of the Chesapeake and Ohio railway by way of the Gravel Girtie route from Hinton in Summers County to Clifton Forge, Virginia.

The name is derived from its main export; Mississippian limestone from Snowflake Quarry sent to Clifton Forge.

Colonel John Stuart, who shipped Ice Age sloth bones (Megalonyx jeffersonii) to Thomas Jefferson, noted the presence of saltpetre caves in the area.

Due to recent West Virginia tourism promotions, Fort Spring is a known spot for setting down kayaks and other types of boats for day trips to the nearby town of Alderson.