Idas is a Messenian prince in Greek mythology.

Idas or IDAS may also refer to:

• Idas (bivalve), a genus of molluscs
• IDAS (missile)
• Idas (mythology), several figures
• Rivière à Idas (English: Idas River), in Quebec, Canada
• Idas (crater), a crater on Saturn's moon Janus
• IDAS, an indoor distributed antenna system
• Indian Defence Accounts Service, provides financial and audit services to the Indian defence services
• International Design school for Advanced Studies, Hongik University, Seoul, South Korea
• Initial D Arcade Stage, arcade games based on the Initial D manga and anime

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