| Country: | JPN |
| Type: | National |
| Route: | 390 |
| Map Custom: | yes |
| Map Notes: | Japan National Route 390 highlighted in red |
| Length Km: | 58.2 |
| Length Ref: | [1] |
| Previous Type: | Route |
| Previous Route: | 389 |
| Next Type: | Route |
| Next Route: | 391 |
is both the southernmost and westernmost of the national highways of Japan. It connects Ishigaki, Okinawa on Ishigaki Island, to Miyako-jima, and Naha, Okinawa on Okinawa Island in Japan. Spanning the three islands by ferry, the highway has a total length of 58.2km (36.2miles) on land and 552.2km (343.1miles) when maritime distance is added.
National Route 390 features the 730 Intersection in Ishigaki, a monument to the day when traffic in Okinawa Prefecture was reverted from driving on the right-hand side of the road to the left after the United States relinquished control over the prefecture to Japan following the 1971 Okinawa Reversion Agreement.[2]