Fyn (fün), Ger. Fünen, island (1992 pop. 440,261), c.1,340 sq mi (3,471 sq km), Fyn co., S central Denmark. Odense, Svendborg, Nyborg, Assens, and Middelfart are the chief cities of Fyn, which is the second largest of the Danish islands. It is largely a fertile lowland; dairy goods, sugar beets, and cereals are the chief products. There are many summer residences along the island's coast. The Store Bælt Bridge connects Fyn to Sjælland island.