Deildardalur is a valley in on the eastern side of Skagafjörður, Iceland, leading up from Höfðaströnd to the southeast behind mountains of ÃÂslandshlÃÂð. A little farther into the area, it divides in two: Seljadalur (also called Austurdalur), and Vesturdalur. Sharply wedged between them is Tungufjall mountain. The river , called Grafará further down, runs through the valley. glacier is on the valley floor.
There are a few farms in the valley. A new corral was put in use in Deilardalur as of September 2007, and the valley has quite a lot of pasture land for summer grazing in and up to .