Brother Isle (Old Norse: breiðare øy meaning broad beach island) is a small, uninhabited island in Shetland, Scotland.

It lies between the islands of Yell and Shetland Mainland.

The island's rock is "undifferentiated moine gneiss and quartzite.

"[3] It is sometimes assumed that the "Brother" in the name refers to Culdees/papar who were frequent inhabitants of the smaller islands, however, in this case there is no apparent evidence for this claim, and it would appear to be merely folk etymology.

mile) and surrounded by tidal rips which make landing difficult, it would seem unlikely that the island has ever been inhabited.