Norðurþing (Icelandic pronunciation:[ˈnɔrðʏrˌθiŋk]ⓘ) is a municipality located in northern Iceland. Norðurþing was formed in 2006 when the municipalities of Húsavík, Öxarfjörður, Raufarhöfn, and Kelduneshreppur were merged after special elections in January 2006 and the region was officially declared a new municipality on 10 June 2006.
The biggest town in the municipality is Húsavík, with a population of 2,307 inhabitants. Other settlements include Kópasker (population 122), Raufarhöfn (population 186), and Skinnastaður.