Firmicus may refer to:
*The
lunar crater Firmicus.
*The
Christian
Christians () are people who follow or adhere to Christianity, a monotheistic Abrahamic religion based on the life and teachings of Jesus Christ. The words ''Christ'' and ''Christian'' derive from the Koine Greek title ''Christós'' (Χρι ...
astrologer
Julius Firmicus Maternus (fourth century), after whom the crater is named.
*
''Firmicus'' (spider), a spider genus
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