CSIR may refer to:
Organizations Council for Scientific and Industrial Research, an earlier name for the Commonwealth Scientific and Industrial Research Organisation, Australia, from 1926 to 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
Other uses Channel state information, in wireless communications Cross-sectional interventional radiology, in medecine