Arendal is a town and municipality in the county of Aust-Agder, Norway. Arendal belongs to the traditional region of Sørlandet.
The town of Arendal is the administrative center of the municipality and also of Aust-Agder county. Other villages in the municipality include Tromøy, Rykene, Eydehavn, Strengereid, Kongshamn, Kilsund, and Hisøy.
The offices of UNEP/GRID-Arendal are located in the town of Arendal.