Ilerda may refer to:

• Ilerda, a synonym for the Heliophorus genus of lycaenid butterflies
• Hesperia ilerda, a synonym for Gretna waga species of butterfly
• Ilerda, the name of Lleida in Spain in Ancient Roman times
  • Battle of Ilerda, 49BC
• Ilerda, a typeface of Nacional Typefoundry, Spain

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