Olavinlinna is a 15th-century three-tower castle located in Savonlinna, Finland. It is built on an island in the Kyrönsalmi strait that connects the lakes Haukivesi and Pihlajavesi. It is the northernmost medieval stone fortress still standing. The castle forms a spectacular stage for the Savonlinna Opera Festival, which was held for the first time in the summer of 1912.

Savonlinna is a town in Finland, located in the eastern interior of the country. It lies in the Finnish Lakeland, the South Savo region. The population of Savonlinna is approximately 32,000, while the sub-region has a population of approximately 39,000. It is the 36th most populous municipality in Finland.