| Bihariganj | |
| Native Name: | बिहारिगंज |
| Native Name Lang: | hi |
| Settlement Type: | Community development block |
| Pushpin Map: | India Bihar#India |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in Bihar, India |
| Coordinates: | 25.7358°N 86.9792°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Bihar |
| Subdivision Type2: | Region |
| Subdivision Name2: | Mithila |
| Subdivision Type3: | District |
| Subdivision Name3: | Madhepura |
| Unit Pref: | Metric |
| Population Total: | 101655 |
| Population As Of: | 2001 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Maithili, Hindi |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Blank1 Name Sec1: | Lok Sabha constituency |
| Blank1 Info Sec1: | Madhepura |
| Blank2 Name Sec1: | Vidhan Sabha constituency |
| Blank2 Info Sec1: | Bihariganj |
Bihariganj is one of the administrative divisions of Madhepura district in the Indian state of Bihar. The block headquarters, Bihariganj, is located at a distance of 41 km from the district headquarters, namely, Madhepura. It is one of the main markets and is connected with neighbouring district Purnia by road and railways.
Bihariganj is located at .
Panchayats in Bihariganj community development block are: Pararia, Rajganj, Mohanpur, Gamail, Lakshmipur lalchand, Madhukarchak, Bhabangama, Shekpura, Tulsia, Kusthan, Bihariganj and Hathiaundha.[1]
In the 2001 census Bihariganj Block had a population of 101,655.[2] Bihariganj has 12 Mukhiya & 17 Panchyat samity sadasya.