| Country: | IND |
| Type: | NH |
| Route: | 131 |
| Map Custom: | yes |
| Length Km: | 132 |
| Direction A: | South End |
| Direction B: | North End |
| Terminus B: | Birpur |
| Destinations: |
|
| States: | Bihar |
| Previous Type: | NH |
| Previous Route: | 31 |
| Next Route: | 131A |
| Next Type: | NH |
National Highway 31 (NH 31), previously known as National Highway 106, is a national highway of India. It starts from Birpur in Supaul district to Bihpur in Bhagalpur district and passes through Madhepura district and terminates at Bihpur in Bhagalpur district of Bihar. It is major Highway of Madhepura district which starts at Birpur, passes through Simrahi, connects National Highway 57, Singheshwar, Madhepura junction to National Highway 231 (previously known National Highway 107), Reshna, Gwalpara, Udakisunganj, and terminates at Bihpur connects National Highway 31.[1]
Bihpur, Puraini, Udakishanganj, Reshna Madhepura, Singheswar Sthan, Pipra, Simrahi Bazar, Bhimnagar, Birpur
Terminal at Bihpur
near Madhepura
near Simrahi Bazar
Terminate at Birpur