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 Old Norse form of the name was Leka. The meaning of the name is unknown, but it may come from the word lekke which can mean "gravelly ground".

Dated to the Viking Age, the burial mound Herlaugshaugen is one of the largest (in Norway) from that era.

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.

The coat-of-arms is from modern times; they were granted on 21 April 1989. The arms show the golden wing and claw of an eagle on a red background. (In 1932 a child disappeared on the island, and was refound by an eagles nest.)

The Church of Norway has one parish (sokn) within the municipality of Leka. It is part of the Namdal deanery in the Diocese of Nidaros.

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