Tinnelva is a river in Notodden, Telemark, Norway. It flows from Lake Tinn to Heddalsvatnet. The waterfalls Årlifossene, Grønvollfoss, Svelgfoss and Tinnfoss are exploited, and the hydroelectric power stations have a combined installed capacity of 182 MW.
Coordinates: 59°33′25″N 9°14′50″E / 59.5570°N 9.2473°E