Mousa is a small island in Shetland, Scotland, uninhabited since the nineteenth century. The island is known for the Broch of Mousa, an Iron Age round tower, and is designated as a Special Protection Area for storm-petrel breeding colonies.

Shetland, also called the Shetland Islands, is an archipelago in Scotland lying between Orkney, the Faroe Islands, and Norway. It is the northernmost region of the United Kingdom.