| Country: | IND |
| Type: | NH |
| Route: | 77 |
| Map: | National Highway 77 (India).png |
| Map Notes: | Road map of India with National Highway 77 highlighted in blue |
| Length Km: | 142 |
| Destinations: | Hajipur - Muzaffarpur district - Mehsi - Sheohar - Sitamarhi district |
| Terminus B: | Sonbarsa |
| States: | Bihar |
| Previous Type: | NH |
| Previous Route: | 76 |
| Next Type: | NH |
| Next Route: | 78 |
National Highway 77 is a National Highway of India entirely within the state of Bihar that links Hajipur to Sonbarsa near India-Nepal border, and is 142km (88miles) long.[1]
The National Highway has very important from commercial Point view as it connects North Bihar with South Bihar. It also important because it directly connects south Bihar with the International Border of Nepal.