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CSIS may refer to:
- Canadian Security Intelligence Service, Canada's primary national intelligence service
- Center for Strategic and International Studies, a bipartisan think tank in the US
- Centre for Strategic and International Studies, a think tank in Jakarta, Indonesia
- Civil Service Islamic Society, a British non-political, voluntary society
- Container Shipping Information Service, a trade group for the container shipping industry
|This disambiguation page lists articles associated with the title CSIS.
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