Khitan or Khitai may refer to:
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Khitan (circumcision), the Islamic circumcision rite
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Khitan people, an ancient nomadic people located in Mongolia and northern China
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Liao dynasty (916–1125), a dynasty of China ruled by the Khitan Yelü clan
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Northern Liao (1122–1123), a regime in northern China
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Qara Khitai (1124–1218), alternatively called the "Western Liao", successor to the Liao dynasty in northwestern China and Central Asia
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Eastern Liao (1213–1269), a regime in northeastern China
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Later Liao (1216–1219), a regime in northeastern China
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Khitan language, a now-extinct language once spoken by the Khitan people
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Khitan scripts (disambiguation), writing systems of the Khitan people, for the now-extinct Khitan language
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Khitan large script, a logographic writing system
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Khitan small script, a semi-syllabic and logographic writing system
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Cathay in many languages