| Naugachhia | |
| Native Name: | नवगछिया |
| Native Name Lang: | नौगछिया |
| Settlement Type: | Town |
| Pushpin Map: | India Bihar#India3 |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Bihar, India |
| Coordinates: | 25.4°N 87.1°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Bihar |
| Subdivision Type2: | Region |
| Subdivision Name2: | Mithila[1] |
| Government Type: | Nagar Parishad |
| Governing Body: | Naugachhia Nagar Parishad |
| Unit Pref: | Metric |
| Area Total Km2: | 113 |
| Elevation M: | 25 |
| Population Total: | 49,069 |
| Population As Of: | 2011 |
| Population Density Km2: | 1370 |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Regional language |
| Demographics1 Info1: | Maithili[2] [3] |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code Type: | PIN |
| Postal Code: | 853204 |
| Area Code Type: | Telephone code |
| Area Code: | 06421 |
| Registration Plate: | BR10 |
Naugachhia is a town in the Bhagalpur district of Bihar, situated within the Mithila region of India.[4] [5] [6] In the 2011 census of India, its population was recorded as 49,069. Naugachhia has an average literacy rate of 62%, lower than the national average of 74%: male literacy is 69%, and female literacy is 55%. 18% of the population is under 9 years of age.
Naugachhia may meet the criteria to be a separate district from Bhagalpur. In 2018, a rally was held supporting creating a new district for the town.[7]
The town is connected via rail through the Naugachhia railway station which is on the Barauni–Katihar section of the Sonpur railway division.
Vikramshila Setu is 6th longest bridge over water in India. The 4.7 km long two lane bridge serves as a link between NH 33 and NH 31 running on the opposite sides of the Ganges, connecting Bhagalpur side on the south bank of the Ganges to Naugachhia on the north bank.