Herdla is a former municipality in Hordaland county, Norway. The municipality existed from 1871 until 1964 and it encompassed a large group of about 2,000 islands and skerries covering about of land area, to the northwest of the city of Bergen. The administrative centre of the municipality was the small island-village of Herdla (island). The municipality included the northern third of the island of Holsnøy, the northern third of the island of Askøy, and the islands of Misje, Turøy, Toftøy, Rongøy, Blomøy, Ona, Bognøy, and many smaller surrounding islands.