The Lachlan Island, part of the Maria Island Group, is an island with an area of about 2.5 hectares (6 acres) lying close to the south-eastern coast of Tasmania, Australia.

The island is located near the Freycinet Peninsula, situated midway between Maria Island and the Tasmanian mainland.

[1] Recorded breeding seabird and wader species are little penguin, short-tailed shearwater, kelp gull, sooty oystercatcher and Caspian tern.

Rabbits were introduced in the early 20th century and were eventually eradicated in the 1990s.

This Tasmania geography article is a stub.