ICAS may refer to:
Ilahia college of Arts and Science, India Immaculate Conception Apostolic School, a former boys' boarding school in Center Harbor, New Hampshire Institute of Chartered Accountants of Scotland Institute for China-America Studies Institute of Contemporary Asian Studies at Temple University, Japan Campus International Cooperation on Airport Surveillance, headquartered in Zurich, Switzerland International Council of the Aeronautical Sciences International Council of Arbitration for Sport, the organisation that runs the Court of Arbitration for Sport Isolated congenital asplenia, a disease