| Country: | JPN |
| Type: | National |
| Route: | 140 |
| Image Notes: | Route 140 in Kumagaya |
| Map Custom: | yes |
| Length Km: | 150.4 |
| Length Ref: | [1] |
| Established: | 1953 |
| Direction A: | South |
| Terminus A: | in Fujikawa, Yamanashi |
| Direction B: | North |
| Terminus B: | in Kumagaya |
| Previous Type: | Route |
| Previous Route: | 139 |
| Next Type: | Route |
| Next Route: | 141 |
National Route 140 is a national highway of Japan connecting Kumagaya, Saitama and Fujikawa, Yamanashi in Japan, with a total length of 146.6km (91.1miles).
The route includes the Karisaka Tunnel, first opened in 1998 and at 6.225km (03.868miles) is the fifth-longest road tunnel in Japan.Because it is the main road connecting Saitama and Yamanashi, both prefectures are developing the Nishikanto Road.[2]