Fjære is a former municipality in the old Aust-Agder county in Norway. The 60.4-square-kilometre (23.3 sq mi) municipality existed from 1846 until 1971. It was located to the north of the town of Grimstad. The name is still used to refer to that area, which is now a part of Grimstad municipality in Agder county. The administrative centre of Fjære was the village of Vik, just east of the historic Fjære Church. Other villages in Fjære included Fevik, Dømmesmoen, Frivold, Kroken, and Rønnes.

Aust-Agder was a county (fylke) in Norway until 1 January 2020, when it was merged with Vest-Agder to form Agder county. In 2002, there were 102,945 inhabitants, which was 2.2% of Norway's population. Its area was 9,212 square kilometres (3,557 sq mi). The county's administrative center was the town of Arendal.