Gighay (Scottish Gaelic Gioghaigh) an uninhabited island off the northeast coast of Barra. It is one of ten islands in the Sound of Barra, a Site of Community Importance for conservation in the Outer Hebrides of Scotland.
Gighay lies in the Sound of Barra between Barra and Eriskay, southwest of Fuday. One of a string of islands between South Uist and Barra, Gighay is "locked" into its neighbour Hellisay, with a harbour between. It is mainly gneiss with quartz veins. Gighay has an area of and rises steeply to .
Gighay is owned by the Scottish Ministers (i.e. the Scottish government).