| Mjóifjörður | |
| Settlement Type: | Village |
| Pushpin Map: | Iceland |
| Pushpin Label Position: | left |
| Pushpin Map Caption: | Location in Iceland |
| Subdivision Type: | Country |
| Subdivision Name: |  Iceland |
| Subdivision Type1: | Constituency |
| Subdivision Name1: | Northeast Constituency |
| Subdivision Type2: | Region |
| Subdivision Name2: | Eastern Region |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Fjarðabyggð |
| Population As Of: | 2020 |
| Timezone: | GMT |
| Utc Offset: | +0 |
| Coordinates: | 65.1953°N -13.7922°W |
Mjóifjörður (pronounced as /is/, "narrow fjord") is a village of 7 people in East Iceland, sitting on a fjord of the same name. It is part of the municipality of Fjarðabyggð.
In the early 20th century, the village was a Norwegian whaling station. The village also hosted the Dalatangi light. It is often referred as the smallest village in the country, and one of the most diverse.
The other villages composing the municipality are: Eskifjörður (1,068 inh.), Fáskrúðsfjörður (611 inh.), Neskaupstaður (1,400 inh.),[1] Reyðarfjörður (2,238 inh.) and Stöðvarfjörður (231 inh.).[2]
There is an automatic weather station called Dalatangi[3] near Mjóifjörður. Mjóifjörður has a typical tundra climate (Köppen: ETf), as no month has an average temperature above, although the coldest months all have average temperatures above . It is very humid throughout the year, with the average precipitation greater than in every month except June, and October being the wettest month with an average precipitation of .
Extreme temperatures ranged from on April 1, 1968 to on September 12, 1949.
Mjóafjarðarkirkja, a wooden church in the hamlet Brekka, was built in 1892 with about 100 seats and a ridge turret. The retable dates from 1871. The church was renovated in 1992. The church of Mjóifjörður was already mentioned in a document dating from 1092.[4]
Mjóifjörður has a primary school, a camping site and a hotel with a café.[5]