Aizen may refer to:
*
Aizen Myō-ō (愛染明王), a popular deity in Japanese Buddhism.
*
Sōsuke Aizen (藍染 惣右介), a central antagonist of the manga series ''Bleach''.
See also
*
*
*
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), ...
{{Disambig