Håøya is an island in Porsgrunn Municipality in Telemark county, Norway.

Håøya nature reserve was established in 2002 to preserve a coastal landscape with a large variety of little affected forest types, including the southernmost natural beech forest in the country.

[1] Historically, the island had permanent residents and its own school.

Today, there are no permanent residents, but there are many holiday cottages for vacationers.

[1] The island is known for having summer camps arranged by Oluf Reed-Olsen.