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. At the time of its dissolution, the 66-square-kilometre (25 sq mi) municipality was the 404th largest by area out of the 422 municipalities in Norway. Rennesøy was the 207th most populous municipality in Norway with a population of 4,892. The municipality's population density is 75.4 inhabitants per square kilometre (195/sq mi) and its population has increased by 38.7% over the last decade.