| Country: | JPN |
| Type: | National |
| Route: | 188 |
| Map Custom: | yes |
| Length Km: | 67.7 |
| Length Ref: | [1] |
| Established: | 18 May 1953 |
| Direction A: | North |
| Terminus A: | in Iwakuni |
| Direction B: | South |
| Terminus B: | in Kudamatsu |
| Previous Type: | Route |
| Previous Route: | 187 |
| Next Type: | Route |
| Next Route: | 189 |
National Route 188 is a national highway of Japan connecting Iwakuni and Kudamatsu in Japan, with a total length of 67.7 km (42.07 mi).