Kentucky Route 859 (KY 859) is a 3.184-mile-long (5.124 km), rural, secondary state highway located entirely in Fayette County in east-central Kentucky.

It is locally known as Haley Road, and mainly traverses the eastern portions of the county.

KY 859 originates with a junction with U.S. Route 60 (US 60) east of the Lexington area.

It provides access to Interstate 64 (I-64) before it ends at an intersection with KY 57 (Briar Hill Road).

[2] The entire route is in Fayette County.