Storakersvatnet or Akersvatnet is a lake in the municipality of Rana in Nordland county, Norway. The lake lies about 15 kilometres (9.3 mi) south of the town of Mo i Rana and less than 900 metres (3,000 ft) from the border with Sweden. The original lake was only 15.9 square kilometres (6.1 sq mi), but a dam was built at the northern end so that it can serve as a reservoir for the Rana power station. This dam has caused the lake to enlarge to an area of 42.3 square kilometres (16.3 sq mi).

• List of lakes in Norway
• Geography of Norway
• Rana Hydroelectric Power Station