CSIS
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CSIS may refer to:
- Canadian Security Intelligence Service, a civilian agency of the Canadian government
- Center for Strategic and International Studies, a bipartisan think tank in the United States
- Centre for Strategic and International Studies, a non-profit think tank in Jakarta, Indonesia
- Civil Service Islamic Society, a non-political, voluntary society, representative of mainstream Islamic opinion in central government in the United Kingdom
- Container Shipping Information Service, a trade group for the container shipping industry