CSIR may refer to:

Organizations

• Council for Scientific and Industrial Research, an earlier name for the Commonwealth Scientific and Industrial Research Organisation, Australia between the years 1926 and 1949
• Council for Scientific and Industrial Research – Ghana
• 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