| Demi | |
| Subdivision Type1: | Country |
| Subdivision Name1: | India |
| Subdivision Type2: | State |
| Subdivision Name2: | Gujarat |
| Length: | 75km (47miles) |
| Discharge2 Location: | Arabian Sea |
| Source1 Location: | India |
| Mouth Location: | Arabian Sea, India |
The Demi River is a river in Saurashtra region of Gujarat, India.
Its basin has a maximum length of 75 km. The total catchment area of the basin is .[1] Demi-1, Demi-2 and Demi-3 are dams on this river. Tankara city is situated of the bank of Demi river.