CSIR may refer to:
Organizations:
- Council for Scientific and Industrial Research, an earlier name for the Commonwealth Scientific and Industrial Research Organisation, Australia
- Council for Scientific and Industrial Research, South Africa
- Council of Scientific and Industrial Research, India
- Italian Expeditionary Corps in Russia, or Corpo di Spedizione Italiano in Russia
Technology:
- Channel state information at the receiver
Medicine:
- Cross-sectional Interventional Radiology