Archaea is a domain of single-celled organisms.

Archaea or archea may also refer to:

• Archaea (spider), an extinct genus of Archaeidae
• Archaea (journal), published by Hindawi

• Archaic (disambiguation), an earlier or ancient period or practice
• Archean, or Archæan, an early geological eon
• "archaeo-" ('ancient'), a commonly used taxonomic affixes

This disambiguation page lists articles associated with the title Archaea.
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