Olduvai Hominid number 9 (OH 9) is a fossilized skull cap of an early hominin, found in LLK II, Olduvai Gorge by Louis S. B. Leakey in 1960. It is believed to be ca. 1.4 million years old. Its cranial capacity is estimated at than 1067 cm³, the largest value among all known African Homo erectus specimens. OH 9 is significant because the features it carried and its correlation to the species classification it resides in.