Evje og Hornnes is a municipality in Aust-Agder county, Norway. It is located in the traditional region of Setesdal. Evje og Hornnes was created as a new municipality on 1 January 1960 after the merger of the two older municipalities of Evje and Hornnes.

During the 1960s, Norway enacted many municipal reforms such as mergers and border adjustments, and the municipality of Evje og Hornnes was established during this time. On 1 January 1960, the neighboring municipalities of Evje (population: 1,646) and Hornnes (population: 1,280) were merged to form Evje og Hornnes. On 1 January 1986, the Lislevand farm area (population: 8) was transferred from neighboring Birkenes municipality to Evje og Hornnes.

The municipalities of Evje and Hornnes were joined in 1960 with the compound name Evje og Hornnes.

The municipality (originally the parish) of Evje is named after an old Evje farm (Old Norse: Efja), since the first church was built there. The name is identical with the word efja which means "eddy".

The municipality (originally the parish) of Hornnes is named after an old Hornnes farm (Old Norse: Hornnes), since the first church was built there. The first element is horn which means "horn" and the last element is nes which means "headland". So the meaning of Hornnes is "the headland shaped like a horn".

The coat-of-arms is from modern times. They were granted on 24 April 1992. The arms show two mining wagons as mining has been of great importance for the area already for many centuries. One of Europe's largest nickel mines is in the municipality.

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