Haixi may refer to:
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Look up Haixi in Wiktionary, the free dictionary.
- Haixi Mongol and Tibetan Autonomous Prefecture, in Qinghai, China
- Haixi Jurchens, group of the Jurchens as identified by the Chinese of the Ming Dynasty
- Songhua River, formerly known as Haixi River
- Roman Egypt, "West of the sea" in Chinese chronicles