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 together 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.