| Tinnelva | |
| Name Other: | Tinne / Tinnåa |
| Pushpin Map: | Telemark#Norway |
| Pushpin Map Caption: | Location of the river |
| Subdivision Type1: | Country |
| Subdivision Name1: | Norway |
| Subdivision Type2: | County |
| Subdivision Name2: | Telemark |
| Subdivision Type3: | Municipalities |
| Subdivision Name3: | Notodden Municipality |
| Length: | 29km (18miles) |
| Source1: | Tinnsjå lake |
| Source1 Location: | Tinnoset, Telemark |
| Source1 Coordinates: | 59.7243°N 9.0235°W |
| Mouth: | Heddalsvatnet lake |
| Mouth Location: | Notodden, Telemark |
| Mouth Coordinates: | 59.5571°N 9.2479°W |
| River System: | Skien watershed |
Tinnelva (also known as Tinne or Tinnåa) is a river in Notodden Municipality in Telemark county, Norway. The 29km (18miles) long river flows between two lakes: Tinnsjå and Heddalsvatnet. The river begins at the village of Tinnoset draining from the lake Tinnsjå. It flows to the south and east, past the village of Gransherad and the Gransherad Church, past the Lisleherad Church further downstream, and finally emptying into the lake Heddalsvatnet at the town of Notodden.[1] [2]
There are several waterfalls along the river: Årlifossene, Grønvollfoss, Svelgfoss and Tinnfoss. These waterfalls are exploited for hydroelectric power generation since the river drops about over these four waterfalls. The hydroelectric power stations along the river have a combined installed capacity of 182MW.