Jussarö (Finnish: Jussaari) is a Finnish island in the Gulf of Finland. It is also a national park. It is located in the municipality of Ekenäs, Raseborg, Finland. Jussarö is known for the Jussarö Lighthouse. There is also an iron ore mine, but it was closed in 1967. The iron ore occurrence is the biggest undersea deposit in Finland and caused ships' compasses to malfunction.

In Jussarö, some abandoned buildings still remain, which were used by the military until 2005 for urban war simulations. Many semi-destroyed structures remain from that time, featured in the 2019 TV-series Abandoned Engineering. Jussarö is known as the only ghost town in Finland. Part of the island is open to visitors.

Russian prisoners worked in the undersea Jussarö mines in the 19th century. Conditions were very harsh. The island also had its own parish.

Approximately 200 metres (660 ft) to the north of Jussarö is Lilla Jussarö. This smaller island, consisting of a few houses and a harbour was once owned by Nokia.

• Media related to Jussarö at Wikimedia Commons
• www.jussaro.fi (in Finnish)
• Photos from Jussarö at panoramio.com
• Jussarö lighthouse / Virtual Boat Trip
• YLE (Finnish Broadcasting Corporation) Archived 2007-11-25 at the Wayback Machine (in Swedish)

59°49′36″N 023°34′06″E / 59.82667°N 23.56833°E / 59.82667; 23.56833