Eidfjord is a municipality in Hordaland county, Norway. The municipality is located in the traditional district of Hardanger. The administrative centre of the municipality is the village of Eidfjord, where the majority of the municipal population lives. The other major population centre in the municipality is the village of Øvre Eidfjord.

Eidfjord is situated at the end of the Eidfjorden, an inner branch of the large Hardangerfjorden. The village of Eidfjord is a major cruise ship port of call. Eidfjord has several tourist sites, like the Sima Power Plant which is built into the mountain itself, the Måbødalen valley, and the Vøringsfossen waterfall which has a free fall of 182 metres (597 ft). Large parts of the Hardangervidda (Europe's largest mountain plateau) are located in Eidfjord. The Hardangervidda Natursenter, a visitors centre and museum for Hardangervidda National Park, is located in Øvre Eidfjord.

In 2016 the chief of police formally suggested that the police station Ullensvang og Eidfjord, be closed down.

The parish of Graven (later spelled "Granvin") was established as a municipality on 1 January 1838 (see formannskapsdistrikt). This large municipality/parish included two annexes: Ulvik and Eidfjord. On 1 January 1859, Ulvik became the main parish, making Granvin and Eidfjord annexes to Ulvik, and the name of the large municipality was changed from Granvin to Ulvik.

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