Mandora Marsh, also known as Mandora Salt Marsh, is a complex and diverse wetland system in Western Australia close to Eighty Mile Beach, and included in the Eighty Mile Beach Ramsar Site. It lies at the western edge of the Great Sandy Desert bioregion and within the Mandora Station pastoral lease. The marsh is part of the 3337 km2 Mandora Marsh and Anna Plains Important Bird Area, identified as such by BirdLife International because of its importance for supporting large numbers of waders and waterbirds.