| State: | KY |
| Type: | KY |
| Route: | 63 |
| Map Custom: | yes |
| Length Mi: | 35.783 |
| Length Ref: | [1] |
| Direction A: | South |
| Terminus A: | just south of Gamaliel |
| Junction: | near Gamaliel at Gamaliel in Tompkinsville at Temple Hill |
| Direction B: | North |
| Terminus B: | in Glasgow |
| Counties: | Barren, Monroe |
| Previous Type: | US |
| Previous Route: | 62 |
| Next Type: | I |
| Next Route: | 64 |
Kentucky Route 63 (KY 63) is a north–south state highway that traverses Monroe and Barren counties in south central Kentucky.
KY 63 starts at the Tennessee state line, where the road continues southward as Tennessee State Route 56 (SR 56). Just north of that point is Gamaliel, where it intersects Bugtussle Road (KY 382), and begins its concurrency with KY 100. The two routes have intersections with KY 1860, and KY 1366 during the concurrency from Gamaliel to Tompkinsville. The two routes split at their junction with KY 375 (a former alignment of KY 163) in Tompkinsville. KY 63 turns northwestward to the KY 678 junction at Mount Hermon.
After entering Barren County, it meets KY 1324 at Temple Hill. KY 63 continues northwest to Glasgow, traversing the Louie B. Nunn Cumberland Parkway via an overpass. The route ends with U.S. 31E Business just south of the Barren County Courthouse. A few KY 63 trailblazer signs are posted in a few locations in that city.
Most of the KY 63 corridor between Tompkinsville and Glasgow is recognized as a Kentucky Scenic Byway, which signifies that KY 63 provides a scenic drive through most of its course in Monroe and Barren counties. Also, KY 63, along with the first 10miles of KY 90 and parts of KY 70 between Mammoth Cave National Park and Cave City are parts of the "Cordell Hull Scenic Highway".
Since 1986, KY 63 from Tompkinsville to Glasgow, along with KY 90 northwest of Glasgow, is the core route of the annual Roller Coaster Yard Sale.[2]