| State: | KY |
| Type: | KY |
| Route: | 138 |
| Map Custom: | yes |
| Map Notes: | KY 138 highlighted in red |
| Length Mi: | 33.434 |
| Length Ref: | [1] |
| Direction A: | West |
| Terminus A: | near Dixon |
| Junction: |
|
| Direction B: | East |
| Terminus B: | near Livermore |
| Counties: | Webster, Hopkins, McLean |
| Previous Type: | KY |
| Previous Route: | 137 |
| Next Type: | KY |
| Next Route: | 139 |
Kentucky Route 138 (KY 138) is a 33.434adj=midNaNadj=mid state highway in Kentucky. It runs from KY 132 northeast of Dixon to U.S. Route 431 (US 431) south of Livermore via Slaughters.