| Country: | JPN |
| Type: | National |
| Route: | 151 |
| Map Custom: | yes |
| Length Km: | 137.4 |
| Length Ref: | [1] |
| Direction A: | North |
| Terminus A: | Prefectural Route 8 / Prefectural Route 15 in Iida, Nagano |
| Direction B: | South |
| Terminus B: | in Toyohashi, Aichi |
| Previous Type: | Route |
| Previous Route: | 150 |
| Next Type: | Route |
| Next Route: | 152 |
National Route 151 is a national highway of Japan connecting Iida, Nagano and Toyohashi, Aichi in Japan, with a total length of 137.4 km (85.38 mi).