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
See also
CSI (disambiguation)