| State: | HI |
| Type: | HI |
| Route: | 540 |
| Alternate Name: | Halewili Road |
| Map Custom: | yes |
| Length Mi: | 3.9 |
| Length Round: | 1 |
| Direction B: | East |
| Terminus B: | in Eleele |
| Direction A: | West |
| Terminus A: | in Kalaheo |
| Counties: | Kauai |
| Previous Type: | HI |
| Previous Route: | 480 |
| Next Type: | HI |
| Next Route: | 541 |
Route 540 (Route 540) is a 3.9adj=midNaNadj=mid state highway that stretches from Route 50 in Eleele back to Route 50 in Kalaheo on the island of Kauai.
The road is mainly an alternative to Route 50 and for the first 1miles, the Pacific Ocean is in view as the highway travels easterly. Route 540 then takes a sharp turn north at the Kauai Coffee plant, towards Kalaheo. Numerous agriculture fields surround the road.