CCSSCaja Costarricense del Seguro Social (Costa Rican Social Security Institution)
CCSSCenter for Civil Society Studies
CCSSChildhood Cancer Survivor Study (St. Jude Children's Research Hospital; Memphis, TN)
CCSSCommission des Comptes de la Sécurité Sociale (French: Social Security Accounts Commission)
CCSSCommodity Command Standard System
CCSSCentre Commun de la Sécurité Sociale (French: Joint Center for Social Security; Luxembourg)
CCSSCommon Channel Signaling System
CCSSComprehensive Community Support Services (New Mexico)
CCSSCouncil of Christian Scholarly Societies
CCSSCass Community Social Services
CCSSCaisse Commune de Sécurité Sociale (French: Common Fund for Social Security)
CCSSCryptologic Combat Support System
CCSSCenter for Complex Systems Studies (Kalamazoo College)
CCSSCenter for Computer System Security
CCSSComputer Crime and Security Survey
CCSSCombat Command Support System
CCSSComanche Crew Support System
CCSSCommunity Charge for Standard Spending (UK)
CCSSControlled Copy Support Systems, Inc
CCSSCombat Communications Support Squadron
CCSSCommunications Channel Signalling System
CCSSConsolidated Critical Support System
CCSSConference of the Cognitive Science Society
CCSSChaotic Complex Spreading Sequence
CCSSCombat Cryptologic Support System
CCSSCommand & Control Switching Systems
CCSSCommand Center Support System
CCSSCommand Commodity Supply System
CCSSCSIRT Collaboration Support System
CCSSCommand and Control Simulation System
CCSSCoordination Committee on Social Sector
CCSSCanadian Computer Security Symposium
CCSSCadet Command and Staff School (Howard Payne University; Brownwood, TX)
CCSSChina Current Student Society (Harvard University)
CCSSCedar Creek State School (Gold Coast, Australia)
CCSSCruise Control Set Switch
CCSSCommunications-Computer Systems Security
CCSSCoordinating Committee on the Social Sector
CCSSColorado Cactus and Succulent Society