Kolbeinsdalur is a valley on the eastern side of Skagafjörður, Iceland. It reaches north and east of Hjaltadalur, which it runs parallel to (running east south east) until Hjaltadalur curves south near Hólar, while Kolbeinsdalur continues directly eastward. There is a long ridge, often simply called the Ásinn ("the ridge") between the two valleys where they run parallel to one another. A hollow named Hálsgróf (or just Grófin, which means "hollow") is to the east between the ridges and mountains and there is a drivable road over it. A little ways in, the valley curves again to the southeast. The tributary valleys Heljardalur and Skíðadalur are on the eastern side of Kolbeinsdalur, and a little farther in there is the so-called Ingjaldsskál.
