Mousa is a small island in Shetland, uninhabited since the nineteenth century. The island is best known for its Pictish broch (Mousa Broch), an Iron Age round tower.

Mousa is also known for its wildlife, including grey and common seals, guillemots, arctic terns and storm petrels.

The island is readily accessed using the passenger-only ferry which operates from the Shetland Mainland at Leebitton , Sandwick in summer time.