IIR may refer to:
- Institute of International Relations (disambiguation)
- Institute for International Research, a human capital development company acquired by Informa
- International Institute of Refrigeration
- Imaging infrared, in munitions guidance systems
- Indo-Iranian languages
- Infinite impulse response
- Isobutylene isoprene rubber (butyl rubber)
This disambiguation page lists articles associated with the title IIR.If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: