| Tarhasi | |
| Settlement Type: | Block |
| Pushpin Map: | India Jharkhand |
| Pushpin Label Position: | right |
| Pushpin Map Caption: | Location in jharkhand, India |
| Coordinates: | 24.08°N 84.3°W |
| Subdivision Type: | Country |
| Subdivision Name: |  India |
| Subdivision Type1: | State |
| Subdivision Name1: | Jharkhand |
| Subdivision Type2: | District |
| Subdivision Name2: | Palamu |
| Subdivision Type3: | Block |
| Subdivision Name3: | Tarhasi |
| Leader Title1: | MLA |
| Leader Name1: | Devendra Singh (Bittu Singh) Indian National Congress |
| Unit Pref: | Metric |
| Population Total: | 86139 |
| Population As Of: | 2001 |
| Population Density Km2: | auto |
| Demographics Type1: | Languages |
| Demographics1 Title1: | Official |
| Demographics1 Info1: | Magahi, Hindi |
| Timezone1: | IST |
| Utc Offset1: | +5:30 |
| Postal Code Type: | PIN |
| Postal Code: | 822118 |
Tarhasi Block is one of the administrative blocks of Palamu district, Jharkhand state, India situated in the bank of amanat river.