CSIS

CSIS may refer to:


 * Canadian Security Intelligence Service, Canada's primary national intelligence service
 * Center for Strategic and International Studies, a 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
 * China seismic intensity scale, a national standard in the People's Republic of China