Fennia can refer to:
- An old Latin name for Finland, along with Finnia, Finningia and most often used Finlandia that originates from an old conception that people known as Fenni in Tacitus' Germania were Finns
- Fennia (journal), a scientific geography journal
- MS Fennia, a passenger ferry
- Fennia Group, a Finnish insurance group
This disambiguation page lists articles associated with the title Fennia.
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