CSS (disambiguation)
- CS Sfaxien
- CSS
- CSS (band)
- CSS Profile
- CSS code
- Cab Signaling System
- Cadmium telluride photovoltaics
- Campus SuperStar
- Canadian Hydrographic Service
- Capital1 Solar Spikers
- Capital1 Solar Strikers
- Carotid sinus
- Catalina Sky Survey
- Centennial Secondary School (disambiguation)
- Center for Strategic Studies
- Central Security Service
- Central Superior Services
- Certificat de Sécurité Sauvetage
- Chase Secondary School
- Chessington South railway station
- Chicago South Shore and South Bend Railroad
- Chicken Soup for the Soul
- Chilliwack Secondary School
- Chinese space station
- Chirp spread spectrum
- Chowk Sarwar Shaheed
- Cignal Super Spikers (men)
- Cignal Super Spikers (women)
- Citizens Signpost Service
- Clementi Secondary School
- Closed source software
- College of Social Studies
- College of St. Scholastica
- Colorado Springs School
- Columbia Secondary School
- Combat service support
- Combat sidestroke
- Combat stores ship
- Comcast/Charter Sports Southeast
- Commercial space station
- Committee for State Security (Bulgaria)
- Commonwealth Secondary School
- Community Service Society of New York
- Comparison shopping website
- Competition Scratch Score
- Computational social science
- Confederate Secret Service
- Confederate States Ship
- Confederation of Sahel States
- Congregation of the Sacred Stigmata
- Content Scramble System
- Content Services Switch
- Context-sensitive solutions
- Coronary steal
- Courtice Secondary School
- Crockett State School
- Cross-sectional study
- Cross-site scripting
- Cryptogamic Society of Scotland
- Cytokine storm syndrome
- Dongfeng missile
- Ghost in the Shell
- HNLMS Den Helder (A834)
- KGB
- Space Shuttle
- Steam injection (oil industry)
- Supreme Security Council