Unst is an island parish, which lies in Shetland Council Area, some 30 miles (48 km) northeast of Brae and 43 miles (69 km) north of Lerwick in Shetland and includes 3 other small offshore islands.
It is located in the old county of Shetland, which disappeared following the Local Government (Scotland) Act 1974.
The parish has an area of 122.2 sq. km (47.1 sq. miles).