Lyngen is a municipality and a fjord in Troms county, Norway. The administrative centre of the municipality is the village of Lyngseidet.Lyngen was established as a municipality on 1 January 1838 (see formannskapsdistrikt). On 1 January 1867, the Sørfjorden part of Karlsøy municipality (population: 862) was transferred to Lyngen. Then on 1 January 1875, a small part of Lyngen (population: 7) was transferred to Balsfjord. On 1 January 1902, the Sørfjorden area (population: 1,139) was separated from Lyngen to form a new municipality, which later was re-named Ullsfjord.
On 1 January 1964, the northern part of the Lyngen peninsula in Karlsøy municipality (population: 1,001) and the Svensby area of Ullsfjord (population: 171) were merged together with Lyngen. Then on 1 January 1992, the Nordnes area of Lyngen (population: 38) was transferred to the neighboring municipalities of Kåfjord and Storfjord.