- DIIR stands for Department of Information and International Relations (Nepal)
- DIIR stands for Diagnostic Imaging Intelligence Report (medical imaging newsletter)
- DIIR stands for Draft Intelligence Information Report (US Military)
- DIIR stands for Department of Intergovernmental and International Relations (Canada)
- DIIR stands for Department of Innovation, Industry and Regional Development (Australia)
- DIIR stands for Digital Image Intensifier Radiography
DIIR