Salt Island can refer to:
Places United Kingdom Salt Island, Anglesey, Wales Salt Island, British Virgin Islands Salt Island, County Down, a townland in County Down, Northern Ireland
United States Salt Island (Alaska), a small island near Atka Island in the Aleutians, United States Salt Island (Connecticut), United States Salt Island, an island in Isle Royale National Park, Lake Superior, United States
Other places Saltholm, Øresund, Denmark Salt Island, Jamaica Sal, Cape Verde
Other uses Isla de sal (Salt Island), a 1964 Venezuelan film directed by Clemente de la Cerda