| Location Map: | India Kerala#India |
| Country: | India |
| Location: | Pathanamthitta, Kerala |
| Purpose: | P |
| Status: | O |
| Perunthenaruvi Weir | |
| Owner: | Kerala State Electricity Board |
| Dam Type: | G |
| Dam Crosses: | Pamba River |
| Plant Type: | R |
| Plant Capacity: | 6 |
| Website: | Official website |
| Plant Turbines: | 2 × 3 MW |
| Spillway Type: | Ungated - overflow section |
| Coordinates: | 9.4122°N 76.88°W |
| Plant Operator: | Kerala State Electricity Board |
Perunthenaruvi Weir is a diversion dam built across Pamba river at villages of Naranammoozhy and Vechoochira in Pathanamthitta District of Kerala, India. Perumthenaruvi Small Hydroelectric Project 6 MW (2×3) is a run-of-the-river scheme in river Pamba, and the weir is a part of this scheme. This envisages the utilization of water from catchment of Pamba and Azhutha river for electricity generation under a net head of 18.00 m. The power house is located on the left bank of Pamba river. The weir is a concrete gravity type with a height of and a length of . Taluks through which the release flow are Ranni, Konni, Kozhencherry, Thiruvalla, Chengannur, Kuttanadu, Mavelikara and Karthikappally.[1]
The Poonthenaruvi Water falls and related Eco tourism project is near the weir site.[3] There is hanging bridge and view towers to spectate the beauty of the ravine.[4]