| Country: | JPN |
| Type: | National |
| Route: | 148 |
| Map Custom: | yes |
| Length Km: | 69.9 |
| Length Ref: | [1] |
| Established: | 1953 |
| Direction A: | North |
| Terminus A: | in Itoigawa, Niigata |
| Direction B: | South |
| Terminus B: | in Ōmachi, Nagano |
| Previous Type: | Route |
| Previous Route: | 147 |
| Next Type: | Route |
| Next Route: | 149 |
National Route 148 is a national highway of Japan connecting Ōmachi, Nagano and Itoigawa, Niigata in Japan, with a total length of 69.9 km (43.43 mi).