Mead Island is an uninhabited sand island located about from Dirk Hartog Island in the Shark Bay World Heritage Site in Western Australia, and joined to that island at low tide. It has an area of about, and an elevation of .
The island's vegetation is a closed heath, of which the dominant plant species are Nitraria billardierei (Nitre Bush), Scaevola crassifolia (Thick-leaved Fan-flower) and Spinifex longifolius (Beach Spinifex). Other plant species include Exocarpos aphyllus (Leafless Ballart), Rhagodia preissii subsp. obovata, Salsola tragus (Prickly Saltwort), Sonchus oleraceus (Common Sow-thistle), and a species of Pelargonium. Eight species of seabird roost on the island.