Kornstad is a former municipality in Møre og Romsdal county, Norway. The municipality existed from 1897 until its dissolution in 1964. The 66-square-kilometre (25 sq mi) municipality encompassed the western part oft the present-day Averøy Municipality on the island of Averøya, plus a small area in the present-day Hustadvika Municipality on the mainland Romsdal Peninsula to the west of the island. The administrative centre of the municipality was the village of Kornstad where Kornstad Church is located.

The municipality of Kornstad was established on 1 January 1897 when the old Kvernes Municipality was divided. Initially, Kornstad had a population of 1,599. During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1964, the mainland district of Vevang (population: 562) was transferred into the neighboring Eide Municipality and the rest of Kornstad (population: 1,356) was merged into the newly created Averøy Municipality.

The municipality (originally the parish) is named after the old Kornstad farm (Old Norse: Kornastaðir) since the first Kornstad Church was built there. The meaning of the first element is a little uncertain. It may come from the old male name Korni or it could be a shortened version of íkorni which means "squirrel". The last element is the plural form of staðr which means "place" or "village".

While it existed, this municipality was responsible for primary education (through 10th grade), outpatient health services, senior citizen services, unemployment, social services, zoning, economic development, and municipal roads. During its existence, this municipality was governed by a municipal council of directly elected representatives. The mayor was indirectly elected by a vote of the municipal council.

The municipal council (Herredsstyre) of Kornstad was made up of representatives that were elected to four year terms. The party breakdown of the final municipal council was as follows:

• List of former municipalities of Norway