| Official Name: | Organ Cave, West Virginia |
| Pushpin Map: | West Virginia#USA |
| Pushpin Label: | Organ Cave |
| Pushpin Label Position: | left |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | West Virginia |
| Subdivision Type2: | County |
| Subdivision Name2: | Greenbrier |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation Ft: | 2178 |
| Coordinates: | 37.7128°N -80.4411°W |
| Area Code: | 304 & 681 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 1555270[1] |
Organ Cave is an unincorporated community in Greenbrier County, West Virginia, United States. Organ Cave is located along U.S. Route 219 and West Virginia Route 63 at the Organ Cave, 4miles southeast of Ronceverte.
As might seem obvious from the name of the town, the principal attraction here is Organ Cave, the ninth longest mapped cave in the United States. Organ Cave was mined for saltpeter, the principal ingredient of gunpowder, during the Revolutionary War, the War of 1812, and the Civil War. Confederate General Robert E. Lee and his troops held a church service in the main entrance room of the cave during the war. Remains of the Civil War mining are in an excellent state of preservation and are seen on the commercial tour.
The early saltpeter miners discovered the bones of a large, unknown animal. The owner of the cave sent some of the bones (a forearm and a hand with giant claws) to Thomas Jefferson. Thomas Jefferson described them as "Megalonyx" (Latin for Giant Lion). This was the first reported find of a giant ground sloth in the United States. Jefferson soon determined that the animal was actually an extinct sloth, not a lion, but the Genus name "Megalonyx" is retained to this day. This particular genus is now known as Megalonyx jeffersoni.