| Official Name: | Hnífsdalur |
| Settlement Type: | Village |
| Pushpin Map: | Iceland |
| Subdivision Type: | Country |
| Subdivision Type1: | Constituency |
| Subdivision Name1: | Northwest Constituency |
| Subdivision Type2: | Region |
| Subdivision Name2: | Westfjords |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Ísafjarðarbær |
| Population As Of: | 1 January 2024 |
| Population Total: | 210 |
| Postal Code Type: | Póstnúmer |
| Postal Code: | 410 |
| Timezone: | GMT |
| Utc Offset: | +0 |
Hnífsdalur (in Icelandic pronounced as /ˈn̥ifsˌtaːlʏr̥/) is a small village in the municipality of Ísafjarðarbær, located between Bolungarvík and Ísafjörður. The literal meaning of the name is "Knife's Valley". Some guess that the thin or sharp line of the mountain range resembles that of a knife. No mention is made of the place in the Book of Settlement.
In 1910 an avalanche killed 20 people in Hnífsdalur,[1] one of the deadliest in Iceland in the 20th century.
On 25 September 2010, Bolungarvíkurgöng, a 5,156 m (16,916 ft) tunnel between Hnífsdalur and neighbouring town Bolungarvík, was opened.[2]