西山 is an East Asian name meaning "Western mountain" or "Western mountains".

西山 may refer to:

• Xishan (disambiguation) (xīshān), the Chinese pinyin transliteration
• Nishiyama (disambiguation), the Japanese transliteration of native Japanese reading
• Seizan, Japanese transliteration of borrowed Chinese reading
  • Shōkū, Buddhist monk, also called Seizan
  • Seizan, Buddhist sect, named for the monk

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