| Dhumnagiar | |
| 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 |
Dhumnagiar is a village in West Champaran district in the Indian state of Bihar.
As of 2011 India census, Dhumnagiar had a population of 5288 in 949 households. Males constitute 52.49% of the population and females 47.5%. Dhumnagiar has an average literacy rate of 43.75%, lower than the national average of 74%: male literacy is 62.1%, and female literacy is 37.8%. In Dhumnagiar, 21% of the population is under 6 years of age.[1]