CIOS

CIOS may refer to:


 * Cisco IOS, software used on routers and network switches
 * Cyprus-Israel Optical System, a cable system linking Cyprus and Israel
 * Channel Islands Occupation Society, a military history organisation
 * Combined Intelligence Objectives Subcommittee, an organization gathering technical intelligence in Germany after WW2
 * CIOS-FM 98.5 FM - A radio station licensed to Stephenville, NL