Midsund is a municipality in Møre og Romsdal county, Norway. It is part of the Romsdal region. The administrative centre is the village of Midsund on Otrøya island. Other settlements on the island include Uglvik and Raknes in the north and Nord-Heggdal in the southeast.

The municipality consists of many islands. The main islands are Otrøya, Midøya, and Dryna, as well as the smaller populated islands of Magerøya and Tautra—both are less than 1 square kilometre (250 acres). There are also many tiny uninhabited islands and skerries. The islands all sit at the mouth of the great Romsdal Fjord.

The municipality of Midsund was established on 1 January 1965 when the old municipality of Sør-Aukra (population: 1,912) was merged with part of Midøya island and the neighboring island of Dryna (population: 334) which were part of Vatne municipality.

The municipality is named after the strait that flows between the islands of Otrøya and Midøya, the Midsundet (Old Norse: Miðjusund). The first element of the name Miðja means "middle" and the second element sund means "strait" or "sound".

The coat-of-arms is from modern times. They were granted on 15 May 1987. The arms show two silver triangles on a blue background, representing Otrøya and Midøya islands in the ocean. These two main islands in the municipality are separated by a small strait, the Midsund. The geographical situation is symbolised in the arms.

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