CCDS is an abbreviation that may refer to:
- Canton Country Day School, a private, secular PK-8 school located in Plain Township, Stark County, Ohio.
- Charlotte Country Day School, a private, secular K-12 school located in Charlotte, North Carolina.
- Cincinnati Country Day School, a non-parochial, private school in Indian Hill, Ohio.
- The Committees of Correspondence for Democracy and Socialism, an American democratic socialist organization.
- Consensus CDS Project, a global bioinformatics project involving the NCBI, EBI, WTSI and UCSC.
- Cerebral creatine deficiency syndromes