Lake Chew Bahir (Amharic: ጨው ባሕር č̣ew bāhir, "salty lake") or Lake Istifanos, also called Stefanie, Basso Naebor and Chuwaha, is a lake in Southern Ethiopia on the boundary between the Oromia and the Southern Nations, Nationalities and Peoples' Regions. When the lake is filled, it stretches into northern Kenya. Lying at the center of the Stephanie Wildlife Reserve, the lake measures some by .

This lake is the southernmost and lowest (1,880 ft) of a series of lakes which lie in the north-easterly continuation of the Great Rift Valley; its watershed is separated from the watershed of Lake Turkana by the Humu Range and the hills south of it. The Kumbi Range rises on its eastern side. Chew Bahir is fed from the north by the Weito River, and its tributary the Galana Sagan. The Galana Sagan receives the overflow of Lake Chamo in some years, but no permanent connection exists.

Count Sámuel Teleki was the first European to visit the lake in 1888, and named it for Princess Stéphanie of Belgium, the wife of Crown Prince Rudolf of Austria. Following Teleki's visit, Lake Chew Bahir and the neighboring lakes were explored by Donaldson Smith, V. Bottego, M. S. Welby, Oscar Neumann and others. J. J. Harrison in 1899 found the lake quite dried up, and two years later Count Wickenburg found water only in the northern part. In 1960 the lake covered about 2,000 km², but shrank to a swamp over the rest of the 20th century.

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