| Country: | JPN |
| Type: | National |
| Route: | 125 |
| Map Custom: | yes |
| Length Km: | 128.4 |
| Length Ref: | [1] |
| Established: | 1953 |
| Direction A: | West |
| Terminus A: | in Katori, Chiba |
| Direction B: | East |
| Previous Type: | Route |
| Previous Route: | 124 |
| Next Type: | Route |
| Next Route: | 126 |
National Route 125 is a national highway of Japan connecting Katori, Chiba and Kumagaya, Saitama in Japan, with a total length of 128.4 km (79.78 mi).