Kosi division | |
|---|---|
Division of Bihar | |
 Location of Kosi division in Bihar | |
| Coordinates: 25°53′N 86°36′E / 25.88°N 86.6°E | |
| Country |  India |
| State |  Bihar |
| Region | Mithila |
| Headquarters | Saharsa |
| Districts | Saharsa, Madhepura and Supaul |
| Population (2011) | |
| • Total | 12,120,117 |
Kosi division is an administrative geographical unit of Bihar state of India. Saharsa is the administrative headquarters of the division. Currently (2022), the division consists of Saharsa district, Madhepura district, and Supaul district.