| Country: | JPN |
| Type: | National |
| Route: | 191 |
| Map Custom: | yes |
| Length Km: | 284.1 |
| Length Ref: | [1] |
| Established: | 18 May 1953 |
| Direction A: | West |
| Terminus A: | in Shimonoseki |
| Direction B: | East |
| Terminus B: | in Naka-ku, Hiroshima |
| Previous Type: | Route |
| Previous Route: | 190 |
| Next Type: | Route |
| Next Route: | 192 |
National Route 191 is a national highway in Japan connecting Shimonoseki, Yamaguchi and Naka-ku, Hiroshima in Japan, with a total length of 284.1km (176.5miles).