IDRA can stand for several things, including:

• International Distance Running Association:

  An organization promoting and overseeing long-distance running events.

• Internet Defense Reserve Agency:

  A cybersecurity initiative or organization.

• International Derivatives Regulators Association:

  A group focused on regulating derivatives markets.

• Interagency Disaster Response Assistance:

  A coordinated effort among multiple agencies to respond to disasters.

The specific meaning of IDRA depends on the context in which it is used.