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 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.
Arendal was established in the middle of the 16th century, and was then called Arendall. At that time it had no formal town status.