| State: | KY |
| Type: | KY |
| Route: | 203 |
| Map Custom: | yes |
| Map Notes: | KY 203 highlighted in red |
| Length Mi: | 5.1 |
| Length Round: | 1 |
| Direction A: | South |
| Terminus A: | in Hazel Green |
| Junction: | northwest of Rexville |
| Direction B: | North |
| Terminus B: | in Mize |
| Counties: | Wolfe, Morgan |
| Previous Type: | KY |
| Previous Route: | 201 |
| Next Type: | KY |
| Next Route: | 204 |
Kentucky Route 203 (KY 203) is a 5.1adj=midNaNadj=mid state highway in the U.S. state of Kentucky. The highway connects mostly rural areas of Wolfe and Morgan counties with Hazel Green and Mize.
KY 203 begins at an intersection with KY 191 (Main Street) in Hazel Green, within Wolfe County. It travels to the northeast and curves to the north-northeast and enters Morgan County. The highway parallels Caskey Fork before it intersects the northern terminus of KY 3089 (Nickell Fork–Daysboro Road). It crosses Oldfield Fork and enters Mize, where it meets its northern terminus, an intersection with U.S. Route 460.