Vallay () is an uninhabited tidal island in the Scottish Outer Hebrides. It can be reached from North Uist by a long beach at low tide.
thumb|left|Southeast coast of Vallay seen from Solas.
thumb|left|The abandoned mansion of Erskine Beveridge in July 2004
Once the island supported a population of nearly sixty people. Its best-known inhabitant was the archaeologist Erskine Beveridge. The island is also known for its sea birds and for prehistoric monuments.
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