KNM ER 1805 is the catalog number given to several pieces of a fossilized skull of the species Homo habilis. It was discovered in Koobi Fora, Kenya in 1974. The designation indicates specimen 1805, collected from the east shore of Lake Rudolf (now Lake Turkana) for the Kenya National Museums. It is estimated to be 1.74 million years old. Due to its incompleteness it has been the subject of debate as to its classification. It was originally classified as Homo erectus but due to the projection of the face and the shape of the cranium, it is now generally classified as H. habilis. The brain capacity is about 582 cm³.
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