Lake Carabundup is an ephemeral salt lake located in the Great Southern region of Western Australia, approximately 25 km (16 mi) south west of Cranbrook and 30 km (19 mi) north east of Rocky Gully.

It covers an area of 1.85 km2 (0.71 sq mi) and has a volume of 5.17 GL (183,000,000 cu ft) at overflow level with a maximum depth of 4 m (13 ft) when at full capacity.

The average inflow into the lake from 1973 to 2001 was 1.9 GL (67,000,000 cu ft), of which about 84% evaporates.

There are rarely any instances of overflow from the area into the river system even after clearing has increased surface water runoff.

[4] The lake provides habitat for at least three species of shore bird,[5] including the musk duck.