Zhoukoudian or Choukoutien (Chinese: 周口店; pinyin: Zhōukǒudiàn, IPA: [tʂóʊkʰòʊtjɛ̂n]) is a cave system in Beijing, China. It has yielded many archaeological discoveries, including one of the first specimens of Homo erectus, dubbed Peking Man, and a fine assemblage of bones of the gigantic hyena Pachycrocuta brevirostris. Peking Man lived in this cave approximately 750,000 to 200,000 years ago.

The Peking Man Site was discovered by Johan Gunnar Andersson in 1921 and was first excavated by Otto Zdansky in 1921 and 1923 unearthing two human teeth. These were later identified by Davidson Black as belonging to a previously unknown species and extensive excavations followed.

Fissures in the limestone containing middle Pleistocene deposits have yielded the remains of about 45 individuals as well as animal remains and stone flake and chopping tools. The oldest are some 750,000 years old.

During the Upper Palaeolithic, the site was re-occupied and remains of Homo sapiens and its stone and bone tools have also been recovered from the Upper Cave.