Fonyód (German: Fonjod) is a town and holiday resort on the southern shore of Lake Balaton, in north-west Somogy County, western Hungary, with over 4,700 residents.

Maps from the 14th century show Fonyód as an island (with Balaton being larger), with a castle.

The construction of a railway around Lake Balaton greatly contributed to the village's development.

By 1900, Fonyód had become a holiday resort, and by 1910 over a thousand visitors were arriving each year.

The town is famous for its mineral water which is bottled there under the name Fonyódi and is owned by the Croatian company, Jana (part of Agrokor).