Jon Ingesson Kuvlung (died 1188) was a pretender to the Royal Crown during the civil war era in Norway. He was a rival of the reigning King Sverre of Norway.
Jon Ingesson was claimed to be a son of former King Inge I of Norway, although the Sverris saga, the main source of information for this period of Norwegian history, claims this to have been false. Jon Ingesson was a young cleric when he was set up to the task of figurehead. He was then living as a monk at Hovedøya Abbey on the island of Hovedøya outside Oslo. The nickname Kuvlung derives from Old Norse word kuvl meaning monk cloak. Jon Kuvlung ruled in the region of Viken as rival king until killed by Birkebeiners in Bergen in 1188.
During the autumn 1185, former supporters of King Magnus V of Norway from Viken met with Jon Kuvlung. Jon Kuvlung was subsequently declared to be king at Haugating in Tønsberg. The leading man was Símon Kárason whose wife, Margrete Arnesdotter (Margrét Arnadóttir), had been the half-sister of King Inge I of Norway and the granddaughter of dowager Queen Ingrid Ragnvaldsdotter. Margrét Arnadóttir was additionally the full sister of Nikolás Arnason, Bishop of Oslo and a prominent opponent of King Sverre. Símon Kárason and Margrét Arnadóttir were also the parents of Philippus Simonsson, a future pretender to the throne of Norway.