Mjóifjörður
Mjóifjörður stands for:
- Mjóifjörður (Austfirðir) , a fjord in the eastern Icelandic region of Austurland
- Mjóifjörður (Ísafjarðardjúp) , a fjord in the western Icelandic region of Vestfirðir
- Mjóifjörður (Kerlingarfjörður) , a fjord in the south of the western Icelandic Vestfirðir
- a formerly independent rural community in Iceland, see Fjarðabyggð