Vemork

thumb|upright=1.3|250 px|Site of the plant in 2003

Vemork is a hydroelectric power plant and a museum outside the town of Rjukan in Tinn Municipality in Telemark county, Norway. The plant was built by Norsk Hydro and opened in 1911, its main purpose being to fix nitrogen for the production of fertilizer. At opening, it was the world's largest power plant with a capacity of .