| Harsidhi | |
| Native Name Lang: | hindi |
| Settlement Type: | City |
| Pushpin Map: | India Bihar |
| Coordinates: | 26.66°N 84.71°W |
| Subdivision Type: | Country |
| Subdivision Name: | India |
| Subdivision Type1: | State |
| Subdivision Type2: | District |
| Subdivision Name1: | Bihar |
| Subdivision Name2: | East Champaran district |
| Unit Pref: | Metric |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code: | 845422 |
| Blank1 Name Sec1: | Lok Sabha constituency |
| Blank1 Info Sec1: | Motihari |
| Demographics1 Info1: | Hindi |
| Blank2 Name Sec1: | Vidhan Sabha constituency |
| Blank2 Info Sec1: | Harsidhi (Vidhan Sabha constituency) |
Harsidhi is a small town and one of the 27 blocks in East Champaran district in the Indian state of Bihar. It is located 30 kilometers from the district headquarters Motihari.[1] [2]