Kirkeøy is the largest island in the Norwegian municipality of Hvaler. Its name means "church island" and is derived from the island's church, which is also the main church of the municipality. The island is 29,6 km2 and has 1098 inhabitants as of 2001. The island's topography is distinguished by outcrops and forests. To the south of the island lies the village of Skjærhalden, which is also the administrative centre of the municipality. There are a lot of holiday cottages on the island, which is a popular destination for tourists in the summer. The island is since 1989 connected with the mainland through an underwater tunnel to Asmaløy. From Asmaløy there are bridges to Fredrikstad.

Kirkeøy is the largest island in the Norwegian municipality of Hvaler. Its name means "church island" and is derived from the island's church, which is also the main church of the municipality. The island is 29,6 km2 and has 1098 inhabitants as of 2001. The island's topography is distinguished by outcrops and forests. To the south of the island lies the village of Skjærhalden, which is also the administrative centre of the municipality. There are a lot of holiday cottages on the island, which is a popular destination for tourists in the summer. The island is since 1989 connected with the mainland through an underwater tunnel to Asmaløy. From Asmaløy there are bridges to Fredrikstad.