| Koirganwan | |
| Native Name Lang: | hi |
| Settlement Type: | Village |
| Pushpin Map: | India Bihar |
| Coordinates: | 27.108°N 84.464°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Bihar |
| Subdivision Type2: | District |
| Subdivision Name2: | West Champaran district |
| Unit Pref: | Metric |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Hindi |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Iso Code: | IN-BR |
Koirganwan is a village in West Champaran district in the Indian state of Bihar.
As of the 2011 Indian census, Koirganwan had a population of 1699 in 325 households. Males constitute 50.67% of the population and females 49.32%. Koirganwan has an average literacy rate of 55.79%, lower than the national average of 74%: male literacy is 61.39%, and female literacy is 38.1%. In Koirganwan, 15.5% of the population is under 6 years of age.[1]