Aizen may refer to:
*
Aizen Myō-ō (愛染明王), a Japanese Buddhist deity
*
Sōsuke Aizen (藍染 惣右介), a main antagonist of the manga series ''Bleach''
See also
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Eizen Eisen is a German surname meaning "iron". Notable people with the surname include:
*Arnold Eisen, professor of Jewish studies
* Arthur Arturovich Eisen, a Russian soloist with the Alexandrov Ensemble
*Charles-Dominique-Joseph Eisen (1720–1778), ...
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