Leka is a municipality in Nord-Trøndelag county, Norway. It is part of the Namdalen region. The administrative centre of the municipality is the village of Leknes. Other villages include Sør-Gutvika and Madsøygrenda.
Primarily a fishing and farming community, Leka is the northernmost municipality in Trøndelag. The island has been inhabited for at least 10,000 years, as evidenced by cave drawings in the Solsem section of the island.
The municipality of Leka was established on 1 October 1860 when it was separated from the large municipality of Kolvereid. Initially, the population of Leka was 1,702. On 1 January 1909, the southern district of Leka (population: 881) was separated from Leka to form the new municipality of Gravvik. This left Leka was 1,209 residents. The borders of Leka have not changed since then.