IRDA may refer to:

• Infrared Data Association, an interest group for developing infrared data communication protocols
• Insurance Regulatory and Development Authority, a government agency in India
• Intermittent rhythmic delta activity, a type of abnormal brain wave
• Iskandar Regional Development Authority, Malaysia
• International Reborn Doll Artists, a group promoting the making of reborn dolls
• Irda (Dragonlance), a fictional species in the Dragonlance series
• The Irda, a Dragonlance novel by Linda P. Baker