Agunah is a halachic term for a Jewish woman who is "chained" to her marriage.

Aguna or agunah may also refer to:

• Aguna (butterfly), a genus of skipper butterfly
  • Aguna metophis, the tailed aguna, is a species of dicot skipper in the butterfly family Hesperiidae
  • Aguna claxon, the emerald aguna, is a species of dicot skipper in the butterfly family Hesperiidae
  • Aguna asander, the gold-spotted aguna, found in Texas, USA, and in Belize
  • Aguna aurunce hypozonius, found in Belize
  • Aguna panama, found in Belize
• Agunaix, a monotypic moth genus in the subfamily Arctiinae
• Aguna language, a Gbe language of Benin and Togo
• The Agunah, a 1974 novel by Chaim Grade
• Aguna, a Georgian wine