CSH is a three-letter acronym with multiple meanings:
- Caesium hydride, a crystalline solid with the molecular formula CsH
- Calcium silicate hydrate, or calcium silicate hydrogel, the main component of cement paste
- Canadian Subject Headings is a list of subject headings of Canadian topics
- Chartwell Seniors Housing, a real estate investment trust in Canada
- Case Study Houses, experiments in American residential architecture from 1945 until 1966
- Cecil Sharp House, home of the English Folk Dance and Song Society
- Code for Sustainable Homes
- Cold Spring Harbor Laboratory, a genetics laboratory in Cold Spring Harbor
- Cold Spring Harbor, New York, a town on Long Island
- See also Cold Spring Harbor (disambiguation)
- Combat Support Hospital, a type of military field hospital
- Computer Science House, a special interest house at Rochester Institute of Technology
- Context-sensitive help, method of providing online help
- Sun Hei SC, a football club in Hong Kong
- Coordination Syndical Haitien, the Haitian Trade Union Coordination
- Council for Secular Humanism
- C shell, a Unix shell
- Shanghai Airlines has the ICAO airline designator CSH
- Convent of the Sacred Heart (disambiguation)
- Cash America International has the NYSE designator CSH
- CSH Protocols, an on-line scientific journal for biologists
- Coordination Syndicale Haïtienne (CSH), a Haitian trade union
- Coalition to Save Harlem
- Photoshop Custom Shape Object, a file format for use with Adobe Photoshop