Lake Lewis is an ephemeral salt lake in the Northern Territory of Australia located in the locality of Anmatjere about north-west of the town of Alice Springs.
The lake is fed by several nearby creeks; during periods of heavy rain, the lake can grow beyond its usual size and can last as long as six months. The lake system encompasses a number of different terrains, including large areas of saltpans and claypans. Lake Lewis is bounded in the north by Stuart Bluff Range.
The lake was named after John W Lewis, who accompanied P.E. Warburton's expedition in 1873 from the Northern Territory to the Oakover River in Western Australia.
Lake Lewis is also an important site for birds with Black-winged Stilts and Grey Teals, both uncommon species in the Northern Territory, being known to visit the lake.
