Leirfjord is a municipality in Nordland county, Norway. It is part of the Helgeland traditional region. The administrative centre of the municipality is the village of Leland. Other villages in Leirfjord include Bardalssjøen and Sundøy. The large Helgeland Bridge is partly located in the municipality, connecting it to Alstahaug and the town of Sandnessjøen.

The municipality of Leirfjord was established on 1 July 1915 when it was separated from the municipality of Stamnes. Initially, the municipality had 2,003 residents. In 1945, a small part of Nesna (population: 45) was merged into Leirfjord. On 1 January 1964, Leirfjord (population: 1,936) was merged with the southern part of Nesna (population: 580) and the parts of Tjøtta on the island of Alsta (population: 180) to form a new, larger municipality of Leirfjord.

The municipality is named after the Leirfjorden. The old name of the fjord was probably just Leiri, derived from the name of the river Leira, which has its mouth in the end of the fjord. The river name is derived from the word leirr which means "clay".

The coat-of-arms is from modern times (1992). The arms show a green branch cross on a gold background. It symbolizes forestry and agriculture in the municipality. The arms were designed by Jarle E. Henriksen from Sandnessjøen.

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