Snapper Island is a 1.65 hectare island in Sydney Harbour, Australia. It lies in the main channel of the western section of the harbour, upstream of the Sydney Harbour Bridge, adjacent to the Sydney suburb of Drummoyne. The island was originally a rocky outcrop, but in 1931-2 it was increased in size over seven times by land reclamation, and reshaped into the general plan form of a ship. Since then it has used as a training depot by the Sea Cadets, and as a museum. Today it is in the hands of the Sydney Harbour Federation Trust, who are charged with planning a new future for it.