| Sviðnur | |
| Native Name: | Sviðnur |
| Native Name Lang: | is |
| Nickname: | --> |
| Map: | Iceland |
| Coordinates: | 65.4115°N -22.6111°W |
| Location: | Atlantic Ocean |
| Waterbody: | Atlantic ocean |
| Area M2: | or |
| Area Ha: | --> |
| Length M: | --> |
| Width M: | --> |
| Coastline M: | --> |
| Country: | Iceland |
| Country Admin Divisions Title: | Constituency |
| Country Admin Divisions: | Norðvesturkjördæmi |
| Country Admin Divisions Title 1: | Region |
| Country Admin Divisions 1: | Vestfirðir |
| Country Admin Divisions Title 2: | Municipality |
| Country Capital: | Reykjavík |
| Country Largest City: | Reykjavík |
| Country Capital And Largest City: | Reykjavík |
| Country Largest City Population: | 123 246 |
| Country Leader Title: | President |
| Country Leader Name: | Guðni Th. Jóhannesson |
| Country Area Km2: | 102775 |
| Country 1 Area M2: | or |
| Country 1 Area Ha: | --> |
| Population: | 0 |
| Density Km2: | 0 |
| Languages: | Icelandic |
| Timezone1: | WET |
| Utc Offset1: | +0 |
Sviðnur (pronounced as /is/) is an uninhabited island in the Skáleyjar region of Westfjords, Iceland.