Rennesøy is a former municipality in Rogaland county, Norway. It was merged into Stavanger municipality on 1 January 2020. It was located in the traditional district of Ryfylke. The administrative centre of the municipality is the village of Vikevåg. Other villages in Rennesøy included Askje and Sørbø. The municipality encompassed a number of islands on the south side of the Boknafjorden, north of the city of Stavanger.