Evje og Hornnes is a municipality in Agder county, Norway. It is located in the traditional district of Setesdal. The administrative centre of the municipality is the village of Evje. Other villages in the municipality include Åneland, Dåsnesmoen, Flatebygd, Gautestad, Hornnes, Kjetså, and Øvre Dåsvatn. 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. The Norwegian National Road 9 runs north–south through the municipality, along the river Otra.
The 587 km2 municipality is the 191st largest by area out of the 356 municipalities in Norway. Evje og Hornnes is the 210th most populous municipality in Norway with a population of 3,653. The municipality's population density is 6.7 PD/km2 and its population has increased by 4.5% over the previous 10-year period.
During the 1960s, Norway enacted many municipal reforms such as mergers and border adjustments due to the work of the Schei Committee, 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. On 1 January 2019, the Hovlandsdalen area (population: 27) was transferred from neighboring Birkenes municipality to Evje og Hornnes.
