IRDA may refer to:
- Insurance Regulatory and Development Authority, the administrative agency of Government of India for insurance sector supervision and development
- Infrared Data Association, in information and communications technology, a standard for communication between devices (such as computers, PDAs and mobile phones) over short distances using infrared signals
- Intermittent rhythmic delta activity, a type of abnormal brain wave
- Iskandar Regional Development Authority, a key entity to the successful implementation of Iskandar Development Region, Malaysia
- Irda (Dragonlance), a fictional species in the Dragonlance series
- International Reborn Doll Artists, a group promoting the making of reborn dolls