Clonmel Island is a sand island in Corner Inlet, in the Gippsland region of Victoria, Australia. Located within the Nooramunga Marine and Coastal Park, it is a part of a complex of barrier islands that protects a large marine embayment from the pounding waves of the Bass Strait. It is one of the five major islands of Corner Inlet, a Ramsar site, and hosts significant breeding colonies of Caspian terns, crested terns, and Australian fairy terns.
The island is named after the paddle steamer PS Clonmel which was wrecked in the Port Albert Entrance to Corner Inlet, immediately east of the island, in 1841.