Glens Fork is an unincorporated community located in Adair County, Kentucky, United States.

[2] Glens Fork is located in a region of limestone, so the land is perforated by many sinkholes and small caves.

This community has been variously known as Glens Fork, Glennsville or Glenville (not to be confused with Glenville in McLean County) and Hardscratch and was named for its location on Glens Fork of Russell Creek, which was in turn named after David Glenn, whose hunting party camped in the vicinity while securing supplies for George Rogers Clark's Illinois Campaigns.

[3] Glenn and another hunter, William Stewart, had a cabin here used to store meat for the Harrodstown settlers as early as the fall of 1777.

[5] The first deed at the Adair County courthouse dates from June 29, 1802, with the post office established on September 2, 1857, and discontinued on July 31, 1863, because of the American Civil War.