| State: | KY |
| Type: | KY |
| Route: | 123 |
| Map Custom: | yes |
| Map Notes: | KY 123 highlighted in red |
| Length Mi: | 33.031 |
| Length Ref: | [1] |
| Length Round: | 3 |
| Direction A: | South |
| Terminus A: | in rural Hickman County |
| Junction: | |
| Direction B: | North |
| Terminus B: | in Bardwell |
| Counties: | Hickman |
| Previous Type: | KY |
| Previous Route: | 122 |
| Next Type: | KY |
| Next Route: | 124 |
Kentucky Route 123 (KY 123) is a state highway in Kentucky. It runs from KY 307/KY 3061 in rural Hickman County east of Clinton to U.S. Route 51 (US 51) in Bardwell via Clinton and Columbus.