Rennesøy is an island municipality in Rogaland county, Norway. It is located in the traditional district of Ryfylke. The administrative centre of the municipality is the village of Vikevåg. Other villages in Rennesøy include Askje and Sørbø. The municipality encompasses a number of islands on the south side of the Boknafjorden, north of the city of Stavanger.

The parish of Rennesø was established as a municipality on 1 January 1838 (see formannskapsdistrikt). On 1 July 1884, the municipality was split in two with the islands of Mosterøy, Klosterøy, Fjøløy, Kvitsøy, and the western part of Åmøy forming the new municipality of Mosterøy, and the islands of Rennesøy and Brimse remained as Rennesøy municipality. This split left Rennesøy with 1,092 residents, less than half of its previous population. The island of Kvitsøy later became an independent municipality of its own.

On 1 July 1918, the Hanasand area of the neighboring municipality of Finnøy (population: 72) that was located on the island of Rennesøy was transferred to Rennesøy municipality.

On 1 January 1965 a series of municipality mergers took place across the whole country as a result of the work of the Schei Committee. On that date, the municipality of Mosterøy was merged back into Rennesøy. Prior to the merger, Rennesøy had 1,370 residents.

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