| Mapframe: | yes |
| Norðurá | |
| Qid: | Q1595333 |
| Etymology: | "Northern river." Norður means "north" and á means "river." |
| Country: | Iceland |
| Subdivision Type2: | County |
| Subdivision Name2: | Skagafjörður (municipality) |
| Region: | Skagafjörður |
| Mouth: | Héraðsvötn |
| Mouth Coordinates: | 65.4333°N -30°W |
| Source1 Coordinates: | 65.4531°N -18.9736°W |
Norðurá is a river that runs the length of Norðurárdalur valley in Skagafjörður, Iceland, where it creates extensive sandbars on the valley floor.[1] The river joins the Héraðsvötn below Flatatunga.[2] Many tributaries flow into the Norðurá, some located in massive ravines, including Kotá, Valagilsá, Horná, Heiðará, Grjótá, Króká, Egilsá, Stóralækur rivers.[3]