Hornindal is a former municipality in the old Sogn og Fjordane county, Norway. It existed from 1867 until 1965 and then again from 1977 until 2020. It was located in the traditional district of Nordfjord. The administrative centre of the municipality was the village of Grodås. The municipality was located at the eastern end of the lake Hornindalsvatnet, the deepest lake in Northern Europe. The rest of the lake lies inside neighboring Eid Municipality.

Sogn og Fjordane was, up to 1 January 2020, a county in western Norway, when it was merged to become part of Vestland county. Bordering previous counties Møre og Romsdal, Oppland, Buskerud, and Hordaland, the county administration was in the village of Hermansverk in Leikanger municipality. The largest town in the county was Førde.