Bressay is a populated island in the Shetland Islands, Scotland. Bressay lies due south of Whalsay, west of Noss, and north of Mousa. At 11 square miles (28 km2), it is the fifth largest island in Shetland. The population is around 400 people, concentrated in the middle of the west coast, around Glebe, Fullaburn and Maryfield.
The island is made up of old red sandstone with some basaltic intrusions. Bressay was quarried extensively for building materials, used all over Shetland, especially in nearby Lerwick. There are a number of sea caves and arches. The largest of eleven lochs on the island are the Loch of Grimsetter in the east, and the Loch of Brough.