| Acronym | Meaning |
| CSGE | Conformation Sensitive Gel Electrophoresis |
| CSGT | Continuous Set Of Gauge Transformations |
| CSGWPP | Comprehensive State Ground Water Protection Program |
| CSH | Calcium Silicate Hydrate (cement Component) |
| CSH | Centrifugal Sudden Hyperspherical (coordinate Reactive Scattering Code) |
| CSHB | Chemical Safety And Hazard Investigation Board |
| CSHIB | Chemical Safety And Hazard Investigation Board |
| CSHO | Compliance Safety & Health Officer |
| CSI | Chemical Substances Inventory |
| CSI | Chemical Shift Imaging (NMR) |
| CSI | Crystal Structure Imaging |
| CSIA | Compd.-specific Isotope Anal. |
| CSIN | Chemical Substance Information Network |
| CSIR | Chemistry Software And Information Resources |
| CSIR | Council For Scientific And Industrial Research (South Africa) |
| CSIRO | Commonwealth Scientific And Industrial Research Organization |
| CSITE | Consortium For Research On Enhancing Carbon Sequestration In Terrestrial Ecosystems |
| CSM | Continuum Solvation Model |
| CSMA | Chemical Specialties Manufacturers Association |
| CSMCS | Carbon Species Methods Comparison Study |
| CSML | Chemical Structure Markup Language |
| CSMOS | Center For Subsurface Modeling Support |
| CSN-ICP | Conductive Solids Nebulizer-inductively Coupled Plasma |
| CSO | Combined Sewage Overflow(s) |
| CSOM | Confocal Scanning Optical Microscopy |
| CSOV | Constrained Space Orbital Variation |
| CSP | Cathodic Stripping Potentiometry |
| CSP | Chiral Stationary Phase |
| CSP | Cold Shock Protein |
| CSP | Compact Strip Production |
| CSP | Computational Singular Perturbation (math Modeling Method) |
| CSPA | Cold Shock Protein A |
| CSPI | Coherent State Path Integration |
| CSR | Class Switch Recombination |
| CSR | Coke Strength After Reaction |
| CSR | Constant Sampling Rate |
| CSRO | Chemical Short-range Order |
| CSRR | Coupled-state Rigid-rotor |
| CSRS | Cooperative State Research Service (US Dept. Of Agriculture) |
| CSRS | Coherent Stokes-Raman Spectroscopy |
| CST | Central Standard Time |
| CST | Capillary Suction Time (sludge Dewatering Parameter) |
| CST | Charcoal Sorbent Tubes |
| CST | Critical Solution Temperature |
| CSTB | Scientific And Technical Center For Building (French; Centre Scientifique Et Technique Du Batiment) |
| CSTBR | Continuous Stirred Tank Bioreactor |
| CSTEE | Scientific Committee On Toxicity |
| CSTIM | Channeling Scanning Transmission Ion Microscopy |
| CSTL | Chemical Science And Technology Laboratory |
| CSTR | Continuously Stirred Tank Reactor |