| Country: | JPN |
| Type: | National |
| Route: | 312 |
| Map Custom: | yes |
| Length Km: | 153.5 |
| Length Ref: | [1] |
| Previous Type: | Route |
| Previous Route: | 311 |
| Next Type: | Route |
| Next Route: | 313 |
National Route 312 is a national highway of Japan connecting Miyazu, Kyoto and Himeji, Hyōgo in Japan, with a total length of 153.5 km (95.38 mi).