Överuman (Swedish), Över-Uman (Swedish), Umbukta (Norwegian) or Byjjesmehkie (Southern Sami) is a lake on the border between Norway and Sweden. Most of the 52.49-square-kilometre (20.27 sq mi) lake is located in Storuman Municipality in Västerbotten County (southern Swedish Lapland) in Sweden. A small 3.17-square-kilometre (1.22 sq mi) part of the lake, known as Umbukta, is located in Rana Municipality in Nordland County in Norway. The European route E12 highway runs along the eastern side of the lake. The lake lies just southeast of the large lake Storakersvatnet.

• List of lakes in Norway
• Geography of Norway