Storselsøya (also known as Selsøya or Hestmona)[1] is an island in Nordland county, Norway.

The northern and eastern parts of the 13.6-square-kilometre (5.3 sq mi) island are flat and marshy.

There are ferry connections to the surrounding islands and to the mainland at Jektvika.

In 2014, the appeal board for the Norwegian Language Council made a final decision on the name of the island.

A minority on the appeal board wanted Hestmannøy to refer to the southern part in Lurøy Municipality, but that was not approved.