Fennia can refer to:
An old Latin name for Finland, originating from the notion that people known as the Fenni in Tacitus' book Germania were Finns Fennia (journal), published by the Geographical Society of Finland , a car-passenger ferry Fennia Prize, a Finnish design award 1453 Fennia, an asteroid
See also Finnia Wunram (born 1995), German swimmer Fenya, a Russian cant language, currently used in the Russian criminal underworld